Refactor to use a bunch of `into`

43 files changed, 217 insertions, 234 deletions

diff --git a/build.rs b/build.rs
index 8d24e6c..e9d8bda 100644
--- a/build.rs
+++ b/build.rs
@@ -48,7 +48,7 @@ async fn commonmark() {
             let parts = re_in_out.split(&case).collect::<Vec<_>>();
             let input = format!("{}\n", parts[0]);
             let output = if parts[1].is_empty() {
-                "".to_string()
+                "".into()
             } else {
                 format!("{}\n", parts[1])
             };
diff --git a/src/construct/partial_mdx_expression.rs b/src/construct/partial_mdx_expression.rs
index fbb13e0..f5d1c50 100644
--- a/src/construct/partial_mdx_expression.rs
+++ b/src/construct/partial_mdx_expression.rs
@@ -62,7 +62,7 @@ use crate::state::{Name as StateName, State};
 use crate::tokenizer::Tokenizer;
 use crate::util::{constant::TAB_SIZE, mdx_collect::collect};
 use crate::{MdxExpressionKind, MdxExpressionParse, MdxSignal};
-use alloc::{format, string::ToString};
+use alloc::format;
 
 /// Start of an MDX expression.
 ///
@@ -93,7 +93,7 @@ pub fn before(tokenizer: &mut Tokenizer) -> State {
                 "{}:{}: {}",
                 tokenizer.point.line, tokenizer.point.column,
                 tokenizer.tokenize_state.mdx_last_parse_error.take()
-                    .unwrap_or_else(|| "Unexpected end of file in expression, expected a corresponding closing brace for `{`".to_string())
+                    .unwrap_or_else(|| "Unexpected end of file in expression, expected a corresponding closing brace for `{`".into())
             ))
         }
         Some(b'\n') => {
diff --git a/src/mdast.rs b/src/mdast.rs
index 4485167..5e3fca6 100644
--- a/src/mdast.rs
+++ b/src/mdast.rs
@@ -250,7 +250,7 @@ impl ToString for Node {
             | Node::Image(_)
             | Node::ImageReference(_)
             | Node::ThematicBreak(_)
-            | Node::Definition(_) => "".to_string(),
+            | Node::Definition(_) => "".into(),
         }
     }
 }
@@ -1152,12 +1152,12 @@ pub struct MdxJsxAttribute {
 mod tests {
     use super::*;
     use crate::unist::{Point, Position};
-    use alloc::{string::ToString, vec};
+    use alloc::vec;
 
     #[test]
     fn test() {
         let text = Text {
-            value: "a".to_string(),
+            value: "a".into(),
             position: Some(Position {
                 start: Point {
                     line: 1,
diff --git a/src/state.rs b/src/state.rs
index 1cc2720..cbe19a7 100644
--- a/src/state.rs
+++ b/src/state.rs
@@ -2,7 +2,7 @@
 
 use crate::construct;
 use crate::tokenizer::Tokenizer;
-use alloc::string::{String, ToString};
+use alloc::string::String;
 
 /// Result of a state.
 #[derive(Clone, Debug, Eq, PartialEq)]
@@ -34,7 +34,7 @@ impl State {
                 unreachable!("cannot turn intermediate state into result")
             }
             State::Ok => Ok(()),
-            State::Error(x) => Err(x.to_string()),
+            State::Error(x) => Err(x.into()),
         }
     }
 }
diff --git a/src/to_html.rs b/src/to_html.rs
index a0ab152..a851580 100644
--- a/src/to_html.rs
+++ b/src/to_html.rs
@@ -300,7 +300,7 @@ pub fn compile(events: &[Event], bytes: &[u8], options: &CompileOptions) -> Stri
         .buffers
         .get(0)
         .expect("expected 1 final buffer")
-        .to_string()
+        .into()
 }
 
 /// Handle the event at `index`.
@@ -690,7 +690,7 @@ fn on_enter_paragraph(context: &mut CompileContext) {
 /// Handle [`Enter`][Kind::Enter]:[`Resource`][Name::Resource].
 fn on_enter_resource(context: &mut CompileContext) {
     context.buffer(); // We can have line endings in the resource, ignore them.
-    context.media_stack.last_mut().unwrap().destination = Some("".to_string());
+    context.media_stack.last_mut().unwrap().destination = Some("".into());
 }
 
 /// Handle [`Enter`][Kind::Enter]:[`ResourceDestinationString`][Name::ResourceDestinationString].
@@ -1733,7 +1733,7 @@ fn generate_autolink(
         let url = if let Some(protocol) = protocol {
             format!("{}{}", protocol, value)
         } else {
-            value.to_string()
+            value.into()
         };
 
         let url = if context.options.allow_dangerous_protocol {
diff --git a/src/to_mdast.rs b/src/to_mdast.rs
index c4650da..fe5bd82 100644
--- a/src/to_mdast.rs
+++ b/src/to_mdast.rs
@@ -1068,7 +1068,7 @@ fn on_exit_raw_text(context: &mut CompileContext) -> Result<(), String> {
         }
 
         if replace {
-            value = str::from_utf8(&bytes).unwrap().to_string();
+            value = str::from_utf8(&bytes).unwrap().into();
         }
     }
 
@@ -1730,7 +1730,7 @@ fn trim_eol(value: String, at_start: bool, at_end: bool) -> String {
     }
 
     if start > 0 || end < bytes.len() {
-        str::from_utf8(&bytes[start..end]).unwrap().to_string()
+        str::from_utf8(&bytes[start..end]).unwrap().into()
     } else {
         value
     }
@@ -1762,7 +1762,7 @@ fn on_mismatch_error(
             if let Some(left) = left {
                 format!(" before the end of `{:?}`", left.name)
             } else {
-                "".to_string()
+                "".into()
             }
         ));
     }
diff --git a/src/util/char.rs b/src/util/char.rs
index b902fbe..70367f3 100644
--- a/src/util/char.rs
+++ b/src/util/char.rs
@@ -1,10 +1,7 @@
 //! Deal with bytes, chars, and kinds.
 
 use crate::util::unicode::PUNCTUATION;
-use alloc::{
-    format,
-    string::{String, ToString},
-};
+use alloc::{format, string::String};
 use core::str;
 
 /// Character kinds.
@@ -119,7 +116,7 @@ pub fn classify_opt(char_opt: Option<char>) -> Kind {
 /// Format an optional `char` (`none` means eof).
 pub fn format_opt(char: Option<char>) -> String {
     match char {
-        None => "end of file".to_string(),
+        None => "end of file".into(),
         Some(char) => format!("character {}", format(char)),
     }
 }
@@ -127,7 +124,7 @@ pub fn format_opt(char: Option<char>) -> String {
 /// Format an optional `byte` (`none` means eof).
 pub fn format_byte_opt(byte: Option<u8>) -> String {
     match byte {
-        None => "end of file".to_string(),
+        None => "end of file".into(),
         Some(byte) => format!("byte {}", format_byte(byte)),
     }
 }
@@ -136,7 +133,7 @@ pub fn format_byte_opt(byte: Option<u8>) -> String {
 pub fn format(char: char) -> String {
     let representation = format!("U+{:>04X}", char as u32);
     let printable = match char {
-        '`' => Some("`` ` ``".to_string()),
+        '`' => Some("`` ` ``".into()),
         '!'..='~' => Some(format!("`{}`", char)),
         _ => None,
     };
@@ -152,7 +149,7 @@ pub fn format(char: char) -> String {
 pub fn format_byte(byte: u8) -> String {
     let representation = format!("U+{:>04X}", byte);
     let printable = match byte {
-        b'`' => Some("`` ` ``".to_string()),
+        b'`' => Some("`` ` ``".into()),
         b'!'..=b'~' => Some(format!("`{}`", str::from_utf8(&[byte]).unwrap())),
         _ => None,
     };
diff --git a/src/util/character_reference.rs b/src/util/character_reference.rs
index ee2a65c..330293c 100644
--- a/src/util/character_reference.rs
+++ b/src/util/character_reference.rs
@@ -4,7 +4,7 @@ use crate::util::constant::{
     CHARACTER_REFERENCES, CHARACTER_REFERENCES_HTML_4, CHARACTER_REFERENCE_DECIMAL_SIZE_MAX,
     CHARACTER_REFERENCE_HEXADECIMAL_SIZE_MAX, CHARACTER_REFERENCE_NAMED_SIZE_MAX,
 };
-use alloc::string::{String, ToString};
+use alloc::string::String;
 use core::str;
 
 /// Decode named character references.
@@ -89,11 +89,11 @@ pub fn decode_numeric(value: &str, radix: u32) -> String {
             // Lone surrogates, noncharacters, and out of range are handled by
             // Rust.
         ) {
-            return char.to_string();
+            return char.into();
         }
     }
 
-    char::REPLACEMENT_CHARACTER.to_string()
+    char::REPLACEMENT_CHARACTER.into()
 }
 
 /// Decode a character reference.
diff --git a/src/util/sanitize_uri.rs b/src/util/sanitize_uri.rs
index 7006ace..cd0600d 100644
--- a/src/util/sanitize_uri.rs
+++ b/src/util/sanitize_uri.rs
@@ -1,11 +1,7 @@
 //! Make urls safe.
 
 use crate::util::encode::encode;
-use alloc::{
-    format,
-    string::{String, ToString},
-    vec::Vec,
-};
+use alloc::{format, string::String, vec::Vec};
 
 /// Make a value safe for injection as a URL.
 ///
@@ -75,7 +71,7 @@ pub fn sanitize_with_protocols(value: &str, protocols: &[&str]) -> String {
         // If it is a protocol, it should be allowed.
         let protocol = value[0..colon].to_lowercase();
         if !protocols.contains(&protocol.as_str()) {
-            return "".to_string();
+            return "".into();
         }
     }
 
diff --git a/tests/attention.rs b/tests/attention.rs
index 83e68d9..e627c4d 100644
--- a/tests/attention.rs
+++ b/tests/attention.rs
@@ -844,29 +844,29 @@ fn attention() -> Result<(), String> {
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![
                     Node::Text(Text {
-                        value: "a ".to_string(),
+                        value: "a ".into(),
                         position: Some(Position::new(1, 1, 0, 1, 3, 2))
                     }),
                     Node::Emphasis(Emphasis {
                         children: vec![Node::Text(Text {
-                            value: "alpha".to_string(),
+                            value: "alpha".into(),
                             position: Some(Position::new(1, 4, 3, 1, 9, 8))
                         }),],
                         position: Some(Position::new(1, 3, 2, 1, 10, 9))
                     }),
                     Node::Text(Text {
-                        value: " b ".to_string(),
+                        value: " b ".into(),
                         position: Some(Position::new(1, 10, 9, 1, 13, 12))
                     }),
                     Node::Strong(Strong {
                         children: vec![Node::Text(Text {
-                            value: "bravo".to_string(),
+                            value: "bravo".into(),
                             position: Some(Position::new(1, 15, 14, 1, 20, 19))
                         }),],
                         position: Some(Position::new(1, 13, 12, 1, 22, 21))
                     }),
                     Node::Text(Text {
-                        value: " c.".to_string(),
+                        value: " c.".into(),
                         position: Some(Position::new(1, 22, 21, 1, 25, 24))
                     })
                 ],
diff --git a/tests/autolink.rs b/tests/autolink.rs
index 7ef3caa..d2b0956 100644
--- a/tests/autolink.rs
+++ b/tests/autolink.rs
@@ -279,33 +279,33 @@ fn autolink() -> Result<(), String> {
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![
                     Node::Text(Text {
-                        value: "a ".to_string(),
+                        value: "a ".into(),
                         position: Some(Position::new(1, 1, 0, 1, 3, 2))
                     }),
                     Node::Link(Link {
-                        url: "https://alpha.com".to_string(),
+                        url: "https://alpha.com".into(),
                         title: None,
                         children: vec![Node::Text(Text {
-                            value: "https://alpha.com".to_string(),
+                            value: "https://alpha.com".into(),
                             position: Some(Position::new(1, 4, 3, 1, 21, 20))
                         }),],
                         position: Some(Position::new(1, 3, 2, 1, 22, 21))
                     }),
                     Node::Text(Text {
-                        value: " b ".to_string(),
+                        value: " b ".into(),
                         position: Some(Position::new(1, 22, 21, 1, 25, 24))
                     }),
                     Node::Link(Link {
-                        url: "mailto:bravo@charlie.com".to_string(),
+                        url: "mailto:bravo@charlie.com".into(),
                         title: None,
                         children: vec![Node::Text(Text {
-                            value: "bravo@charlie.com".to_string(),
+                            value: "bravo@charlie.com".into(),
                             position: Some(Position::new(1, 26, 25, 1, 43, 42))
                         }),],
                         position: Some(Position::new(1, 25, 24, 1, 44, 43))
                     }),
                     Node::Text(Text {
-                        value: " c.".to_string(),
+                        value: " c.".into(),
                         position: Some(Position::new(1, 44, 43, 1, 47, 46))
                     })
                 ],
diff --git a/tests/block_quote.rs b/tests/block_quote.rs
index 12db252..9d967ee 100644
--- a/tests/block_quote.rs
+++ b/tests/block_quote.rs
@@ -225,7 +225,7 @@ fn block_quote() -> Result<(), String> {
             children: vec![Node::BlockQuote(BlockQuote {
                 children: vec![Node::Paragraph(Paragraph {
                     children: vec![Node::Text(Text {
-                        value: "a".to_string(),
+                        value: "a".into(),
                         position: Some(Position::new(1, 3, 2, 1, 4, 3))
                     }),],
                     position: Some(Position::new(1, 3, 2, 1, 4, 3))
diff --git a/tests/character_escape.rs b/tests/character_escape.rs
index 54944aa..c5c9004 100644
--- a/tests/character_escape.rs
+++ b/tests/character_escape.rs
@@ -109,7 +109,7 @@ fn character_escape() -> Result<(), String> {
         Node::Root(Root {
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![Node::Text(Text {
-                    value: "a * b".to_string(),
+                    value: "a * b".into(),
                     position: Some(Position::new(1, 1, 0, 1, 7, 6))
                 }),],
                 position: Some(Position::new(1, 1, 0, 1, 7, 6))
diff --git a/tests/character_reference.rs b/tests/character_reference.rs
index 1cc732e..4e9a436 100644
--- a/tests/character_reference.rs
+++ b/tests/character_reference.rs
@@ -220,7 +220,7 @@ fn character_reference() -> Result<(), String> {
         Node::Root(Root {
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![Node::Text(Text {
-                    value: "\u{a0} & © Æ Ď\n¾ ℋ ⅆ\n∲ ≧̸".to_string(),
+                    value: "\u{a0} & © Æ Ď\n¾ ℋ ⅆ\n∲ ≧̸".into(),
                     position: Some(Position::new(1, 1, 0, 3, 33, 109))
                 }),],
                 position: Some(Position::new(1, 1, 0, 3, 33, 109))
diff --git a/tests/code_fenced.rs b/tests/code_fenced.rs
index 6da38a9..c41bd43 100644
--- a/tests/code_fenced.rs
+++ b/tests/code_fenced.rs
@@ -287,9 +287,9 @@ fn code_fenced() -> Result<(), String> {
         )?,
         Node::Root(Root {
             children: vec![Node::Code(Code {
-                lang: Some("js".to_string()),
-                meta: Some("extra".to_string()),
-                value: "console.log(1)\nconsole.log(2)".to_string(),
+                lang: Some("js".into()),
+                meta: Some("extra".into()),
+                value: "console.log(1)\nconsole.log(2)".into(),
                 position: Some(Position::new(1, 1, 0, 4, 4, 45))
             })],
             position: Some(Position::new(1, 1, 0, 4, 4, 45))
@@ -303,7 +303,7 @@ fn code_fenced() -> Result<(), String> {
             children: vec![Node::Code(Code {
                 lang: None,
                 meta: None,
-                value: "asd".to_string(),
+                value: "asd".into(),
                 position: Some(Position::new(1, 1, 0, 2, 4, 7))
             })],
             position: Some(Position::new(1, 1, 0, 2, 4, 7))
diff --git a/tests/code_indented.rs b/tests/code_indented.rs
index fd539d3..b02b092 100644
--- a/tests/code_indented.rs
+++ b/tests/code_indented.rs
@@ -212,7 +212,7 @@ fn code_indented() -> Result<(), String> {
             children: vec![Node::Code(Code {
                 lang: None,
                 meta: None,
-                value: "console.log(1)\nconsole.log(2)".to_string(),
+                value: "console.log(1)\nconsole.log(2)".into(),
                 position: Some(Position::new(1, 1, 0, 2, 19, 34))
             })],
             position: Some(Position::new(1, 1, 0, 3, 1, 35))
diff --git a/tests/code_text.rs b/tests/code_text.rs
index 25882c8..89fa63f 100644
--- a/tests/code_text.rs
+++ b/tests/code_text.rs
@@ -187,15 +187,15 @@ fn code_text() -> Result<(), String> {
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![
                     Node::Text(Text {
-                        value: "a ".to_string(),
+                        value: "a ".into(),
                         position: Some(Position::new(1, 1, 0, 1, 3, 2))
                     }),
                     Node::InlineCode(InlineCode {
-                        value: "alpha".to_string(),
+                        value: "alpha".into(),
                         position: Some(Position::new(1, 3, 2, 1, 10, 9))
                     }),
                     Node::Text(Text {
-                        value: " b.".to_string(),
+                        value: " b.".into(),
                         position: Some(Position::new(1, 10, 9, 1, 13, 12))
                     })
                 ],
diff --git a/tests/definition.rs b/tests/definition.rs
index 8357a67..376035a 100644
--- a/tests/definition.rs
+++ b/tests/definition.rs
@@ -506,10 +506,10 @@ fn definition() -> Result<(), String> {
         micromark_to_mdast("[a]: <b> 'c'", &ParseOptions::default())?,
         Node::Root(Root {
             children: vec![Node::Definition(Definition {
-                url: "b".to_string(),
-                identifier: "a".to_string(),
-                label: Some("a".to_string()),
-                title: Some("c".to_string()),
+                url: "b".into(),
+                identifier: "a".into(),
+                label: Some("a".into()),
+                title: Some("c".into()),
                 position: Some(Position::new(1, 1, 0, 1, 13, 12))
             })],
             position: Some(Position::new(1, 1, 0, 1, 13, 12))
diff --git a/tests/frontmatter.rs b/tests/frontmatter.rs
index 335084e..be17a7a 100644
--- a/tests/frontmatter.rs
+++ b/tests/frontmatter.rs
@@ -78,7 +78,7 @@ fn frontmatter() -> Result<(), String> {
         micromark_to_mdast("---\na: b\n---", &frontmatter.parse)?,
         Node::Root(Root {
             children: vec![Node::Yaml(Yaml {
-                value: "a: b".to_string(),
+                value: "a: b".into(),
                 position: Some(Position::new(1, 1, 0, 3, 4, 12))
             })],
             position: Some(Position::new(1, 1, 0, 3, 4, 12))
@@ -90,7 +90,7 @@ fn frontmatter() -> Result<(), String> {
         micromark_to_mdast("+++\ntitle = \"Jupyter\"\n+++", &frontmatter.parse)?,
         Node::Root(Root {
             children: vec![Node::Toml(Toml {
-                value: "title = \"Jupyter\"".to_string(),
+                value: "title = \"Jupyter\"".into(),
                 position: Some(Position::new(1, 1, 0, 3, 4, 25))
             })],
             position: Some(Position::new(1, 1, 0, 3, 4, 25))
diff --git a/tests/gfm_autolink_literal.rs b/tests/gfm_autolink_literal.rs
index 9297163..c608533 100644
--- a/tests/gfm_autolink_literal.rs
+++ b/tests/gfm_autolink_literal.rs
@@ -2752,72 +2752,72 @@ www.a/~
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![
                     Node::Text(Text {
-                        value: "a ".to_string(),
+                        value: "a ".into(),
                         position: Some(Position::new(1, 1, 0, 1, 3, 2))
                     }),
                     Node::Link(Link {
-                        url: "https://alpha.com".to_string(),
+                        url: "https://alpha.com".into(),
                         title: None,
                         children: vec![Node::Text(Text {
-                            value: "https://alpha.com".to_string(),
+                            value: "https://alpha.com".into(),
                             position: Some(Position::new(1, 3, 2, 1, 20, 19))
                         }),],
                         position: Some(Position::new(1, 3, 2, 1, 20, 19))
                     }),
                     Node::Text(Text {
-                        value: " b ".to_string(),
+                        value: " b ".into(),
                         position: Some(Position::new(1, 20, 19, 1, 23, 22))
                     }),
                     Node::Link(Link {
-                        url: "mailto:bravo@charlie.com".to_string(),
+                        url: "mailto:bravo@charlie.com".into(),
                         title: None,
                         children: vec![Node::Text(Text {
-                            value: "bravo@charlie.com".to_string(),
+                            value: "bravo@charlie.com".into(),
                             position: Some(Position::new(1, 23, 22, 1, 40, 39))
                         }),],
                         position: Some(Position::new(1, 23, 22, 1, 40, 39))
                     }),
                     Node::Text(Text {
-                        value: " c ".to_string(),
+                        value: " c ".into(),
                         position: Some(Position::new(1, 40, 39, 1, 43, 42))
                     }),
                     Node::Link(Link {
-                        url: "http://www.delta.com".to_string(),
+                        url: "http://www.delta.com".into(),
                         title: None,
                         children: vec![Node::Text(Text {
-                            value: "www.delta.com".to_string(),
+                            value: "www.delta.com".into(),
                             position: Some(Position::new(1, 43, 42, 1, 56, 55))
                         }),],
                         position: Some(Position::new(1, 43, 42, 1, 56, 55))
                     }),
                     Node::Text(Text {
-                        value: " d ".to_string(),
+                        value: " d ".into(),
                         position: Some(Position::new(1, 56, 55, 1, 59, 58))
                     }),
                     Node::Link(Link {
-                        url: "xmpp:echo@foxtrot.com".to_string(),
+                        url: "xmpp:echo@foxtrot.com".into(),
                         title: None,
                         children: vec![Node::Text(Text {
-                            value: "xmpp:echo@foxtrot.com".to_string(),
+                            value: "xmpp:echo@foxtrot.com".into(),
                             position: Some(Position::new(1, 59, 58, 1, 80, 79))
                         }),],
                         position: Some(Position::new(1, 59, 58, 1, 80, 79))
                     }),
                     Node::Text(Text {
-                        value: " e ".to_string(),
+                        value: " e ".into(),
                         position: Some(Position::new(1, 80, 79, 1, 83, 82))
                     }),
                     Node::Link(Link {
-                        url: "mailto:golf@hotel.com".to_string(),
+                        url: "mailto:golf@hotel.com".into(),
                         title: None,
                         children: vec![Node::Text(Text {
-                            value: "mailto:golf@hotel.com".to_string(),
+                            value: "mailto:golf@hotel.com".into(),
                             position: Some(Position::new(1, 83, 82, 1, 104, 103))
                         }),],
                         position: Some(Position::new(1, 83, 82, 1, 104, 103))
                     }),
                     Node::Text(Text {
-                        value: " f.".to_string(),
+                        value: " f.".into(),
                         position: Some(Position::new(1, 104, 103, 1, 107, 106))
                     })
                 ],
diff --git a/tests/gfm_footnote.rs b/tests/gfm_footnote.rs
index 29b0092..4b2be52 100644
--- a/tests/gfm_footnote.rs
+++ b/tests/gfm_footnote.rs
@@ -46,8 +46,8 @@ fn gfm_footnote() -> Result<(), String> {
                     ..ParseOptions::default()
                 },
                 compile: CompileOptions {
-                gfm_footnote_label: Some("Voetnoten".to_string()),
-                gfm_footnote_back_label: Some("Terug naar de inhoud".to_string()),
+                gfm_footnote_label: Some("Voetnoten".into()),
+                gfm_footnote_back_label: Some("Terug naar de inhoud".into()),
                     ..CompileOptions::default()
                 }
             }
@@ -73,7 +73,7 @@ fn gfm_footnote() -> Result<(), String> {
                     ..ParseOptions::default()
                 },
                 compile: CompileOptions {
-                gfm_footnote_label_tag_name: Some("h1".to_string()),
+                gfm_footnote_label_tag_name: Some("h1".into()),
                     ..CompileOptions::default()
                 }
             }
@@ -99,7 +99,7 @@ fn gfm_footnote() -> Result<(), String> {
                     ..ParseOptions::default()
                 },
                 compile: CompileOptions {
-                gfm_footnote_label_attributes: Some("class=\"footnote-heading\"".to_string()),
+                gfm_footnote_label_attributes: Some("class=\"footnote-heading\"".into()),
                     ..CompileOptions::default()
                 }
             }
@@ -125,7 +125,7 @@ fn gfm_footnote() -> Result<(), String> {
                     ..ParseOptions::default()
                 },
                 compile: CompileOptions {
-                    gfm_footnote_clobber_prefix: Some("".to_string()),
+                    gfm_footnote_clobber_prefix: Some("".into()),
                     ..CompileOptions::default()
                 }
             }
@@ -1632,28 +1632,28 @@ multi-paragraph list items. <a href="#user-content-fnref-longnote" data-footnote
                 Node::FootnoteDefinition(FootnoteDefinition {
                     children: vec![Node::Paragraph(Paragraph {
                         children: vec![Node::Text(Text {
-                            value: "b\nc".to_string(),
+                            value: "b\nc".into(),
                             position: Some(Position::new(1, 7, 6, 2, 6, 10))
                         })],
                         position: Some(Position::new(1, 7, 6, 2, 6, 10))
                     })],
-                    identifier: "a".to_string(),
-                    label: Some("a".to_string()),
+                    identifier: "a".into(),
+                    label: Some("a".into()),
                     position: Some(Position::new(1, 1, 0, 3, 1, 11))
                 }),
                 Node::Paragraph(Paragraph {
                     children: vec![
                         Node::Text(Text {
-                            value: "d ".to_string(),
+                            value: "d ".into(),
                             position: Some(Position::new(4, 1, 12, 4, 3, 14))
                         }),
                         Node::FootnoteReference(FootnoteReference {
-                            identifier: "a".to_string(),
-                            label: Some("a".to_string()),
+                            identifier: "a".into(),
+                            label: Some("a".into()),
                             position: Some(Position::new(4, 3, 14, 4, 7, 18))
                         }),
                         Node::Text(Text {
-                            value: " e.".to_string(),
+                            value: " e.".into(),
                             position: Some(Position::new(4, 7, 18, 4, 10, 21))
                         })
                     ],
diff --git a/tests/gfm_strikethrough.rs b/tests/gfm_strikethrough.rs
index ac6b62c..6109814 100644
--- a/tests/gfm_strikethrough.rs
+++ b/tests/gfm_strikethrough.rs
@@ -405,18 +405,18 @@ u ~**xxx**~ zzz
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![
                     Node::Text(Text {
-                        value: "a ".to_string(),
+                        value: "a ".into(),
                         position: Some(Position::new(1, 1, 0, 1, 3, 2))
                     }),
                     Node::Delete(Delete {
                         children: vec![Node::Text(Text {
-                            value: "alpha".to_string(),
+                            value: "alpha".into(),
                             position: Some(Position::new(1, 5, 4, 1, 10, 9))
                         }),],
                         position: Some(Position::new(1, 3, 2, 1, 12, 11))
                     }),
                     Node::Text(Text {
-                        value: " b.".to_string(),
+                        value: " b.".into(),
                         position: Some(Position::new(1, 12, 11, 1, 15, 14))
                     }),
                 ],
diff --git a/tests/gfm_table.rs b/tests/gfm_table.rs
index 1f0b93c..8e871f6 100644
--- a/tests/gfm_table.rs
+++ b/tests/gfm_table.rs
@@ -1849,28 +1849,28 @@ normal escape: <a href="https://github.com/github/cmark-gfm/issues/277">https://
                         children: vec![
                             Node::TableCell(TableCell {
                                 children: vec![Node::Text(Text {
-                                    value: "none".to_string(),
+                                    value: "none".into(),
                                     position: Some(Position::new(1, 3, 2, 1, 7, 6))
                                 }),],
                                 position: Some(Position::new(1, 1, 0, 1, 8, 7))
                             }),
                             Node::TableCell(TableCell {
                                 children: vec![Node::Text(Text {
-                                    value: "left".to_string(),
+                                    value: "left".into(),
                                     position: Some(Position::new(1, 10, 9, 1, 14, 13))
                                 }),],
                                 position: Some(Position::new(1, 8, 7, 1, 15, 14))
                             }),
                             Node::TableCell(TableCell {
                                 children: vec![Node::Text(Text {
-                                    value: "right".to_string(),
+                                    value: "right".into(),
                                     position: Some(Position::new(1, 17, 16, 1, 22, 21))
                                 }),],
                                 position: Some(Position::new(1, 15, 14, 1, 23, 22))
                             }),
                             Node::TableCell(TableCell {
                                 children: vec![Node::Text(Text {
-                                    value: "center".to_string(),
+                                    value: "center".into(),
                                     position: Some(Position::new(1, 25, 24, 1, 31, 30))
                                 }),],
                                 position: Some(Position::new(1, 23, 22, 1, 33, 32))
@@ -1881,7 +1881,7 @@ normal escape: <a href="https://github.com/github/cmark-gfm/issues/277">https://
                     Node::TableRow(TableRow {
                         children: vec![Node::TableCell(TableCell {
                             children: vec![Node::Text(Text {
-                                value: "a".to_string(),
+                                value: "a".into(),
                                 position: Some(Position::new(3, 3, 57, 3, 4, 58))
                             }),],
                             position: Some(Position::new(3, 1, 55, 3, 6, 60))
@@ -1892,35 +1892,35 @@ normal escape: <a href="https://github.com/github/cmark-gfm/issues/277">https://
                         children: vec![
                             Node::TableCell(TableCell {
                                 children: vec![Node::Text(Text {
-                                    value: "b".to_string(),
+                                    value: "b".into(),
                                     position: Some(Position::new(4, 3, 63, 4, 4, 64))
                                 }),],
                                 position: Some(Position::new(4, 1, 61, 4, 5, 65))
                             }),
                             Node::TableCell(TableCell {
                                 children: vec![Node::Text(Text {
-                                    value: "c".to_string(),
+                                    value: "c".into(),
                                     position: Some(Position::new(4, 7, 67, 4, 8, 68))
                                 }),],
                                 position: Some(Position::new(4, 5, 65, 4, 9, 69))
                             }),
                             Node::TableCell(TableCell {
                                 children: vec![Node::Text(Text {
-                                    value: "d".to_string(),
+                                    value: "d".into(),
                                     position: Some(Position::new(4, 11, 71, 4, 12, 72))
                                 }),],
                                 position: Some(Position::new(4, 9, 69, 4, 13, 73))
                             }),
                             Node::TableCell(TableCell {
                                 children: vec![Node::Text(Text {
-                                    value: "e".to_string(),
+                                    value: "e".into(),
                                     position: Some(Position::new(4, 15, 75, 4, 16, 76))
                                 }),],
                                 position: Some(Position::new(4, 13, 73, 4, 17, 77))
                             }),
                             Node::TableCell(TableCell {
                                 children: vec![Node::Text(Text {
-                                    value: "f".to_string(),
+                                    value: "f".into(),
                                     position: Some(Position::new(4, 19, 79, 4, 20, 80))
                                 }),],
                                 position: Some(Position::new(4, 17, 77, 4, 22, 82))
@@ -1944,7 +1944,7 @@ normal escape: <a href="https://github.com/github/cmark-gfm/issues/277">https://
                 children: vec![Node::TableRow(TableRow {
                     children: vec![Node::TableCell(TableCell {
                         children: vec![Node::InlineCode(InlineCode {
-                            value: "a|b".to_string(),
+                            value: "a|b".into(),
                             position: Some(Position::new(1, 3, 2, 1, 9, 8))
                         }),],
                         position: Some(Position::new(1, 1, 0, 1, 11, 10))
diff --git a/tests/gfm_task_list_item.rs b/tests/gfm_task_list_item.rs
index 8bc0d31..18ae1dd 100644
--- a/tests/gfm_task_list_item.rs
+++ b/tests/gfm_task_list_item.rs
@@ -261,7 +261,7 @@ Text.</li>
                         spread: false,
                         children: vec![Node::Paragraph(Paragraph {
                             children: vec![Node::Text(Text {
-                                value: "a".to_string(),
+                                value: "a".into(),
                                 position: Some(Position::new(1, 7, 6, 1, 8, 7))
                             }),],
                             position: Some(Position::new(1, 7, 6, 1, 8, 7))
@@ -273,7 +273,7 @@ Text.</li>
                         spread: false,
                         children: vec![Node::Paragraph(Paragraph {
                             children: vec![Node::Text(Text {
-                                value: "b".to_string(),
+                                value: "b".into(),
                                 position: Some(Position::new(2, 7, 14, 2, 8, 15))
                             }),],
                             position: Some(Position::new(2, 7, 14, 2, 8, 15))
@@ -285,7 +285,7 @@ Text.</li>
                         spread: false,
                         children: vec![Node::Paragraph(Paragraph {
                             children: vec![Node::Text(Text {
-                                value: "c".to_string(),
+                                value: "c".into(),
                                 position: Some(Position::new(3, 3, 18, 3, 4, 19))
                             }),],
                             position: Some(Position::new(3, 3, 18, 3, 4, 19))
diff --git a/tests/hard_break_escape.rs b/tests/hard_break_escape.rs
index 2e88c95..9f17f10 100644
--- a/tests/hard_break_escape.rs
+++ b/tests/hard_break_escape.rs
@@ -69,14 +69,14 @@ fn hard_break_escape() -> Result<(), String> {
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![
                     Node::Text(Text {
-                        value: "a".to_string(),
+                        value: "a".into(),
                         position: Some(Position::new(1, 1, 0, 1, 2, 1))
                     }),
                     Node::Break(Break {
                         position: Some(Position::new(1, 2, 1, 2, 1, 3))
                     }),
                     Node::Text(Text {
-                        value: "b.".to_string(),
+                        value: "b.".into(),
                         position: Some(Position::new(2, 1, 3, 2, 3, 5))
                     }),
                 ],
diff --git a/tests/hard_break_trailing.rs b/tests/hard_break_trailing.rs
index 907356a..c724c85 100644
--- a/tests/hard_break_trailing.rs
+++ b/tests/hard_break_trailing.rs
@@ -135,14 +135,14 @@ fn hard_break_trailing() -> Result<(), String> {
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![
                     Node::Text(Text {
-                        value: "a".to_string(),
+                        value: "a".into(),
                         position: Some(Position::new(1, 1, 0, 1, 2, 1))
                     }),
                     Node::Break(Break {
                         position: Some(Position::new(1, 2, 1, 2, 1, 4))
                     }),
                     Node::Text(Text {
-                        value: "b.".to_string(),
+                        value: "b.".into(),
                         position: Some(Position::new(2, 1, 4, 2, 3, 6))
                     }),
                 ],
diff --git a/tests/heading_atx.rs b/tests/heading_atx.rs
index 1b6b8a3..736c50a 100644
--- a/tests/heading_atx.rs
+++ b/tests/heading_atx.rs
@@ -231,7 +231,7 @@ fn heading_atx() -> Result<(), String> {
             children: vec![Node::Heading(Heading {
                 depth: 2,
                 children: vec![Node::Text(Text {
-                    value: "alpha".to_string(),
+                    value: "alpha".into(),
                     position: Some(Position::new(1, 4, 3, 1, 9, 8))
                 }),],
                 position: Some(Position::new(1, 1, 0, 1, 11, 10))
diff --git a/tests/heading_setext.rs b/tests/heading_setext.rs
index ed2dfa0..6f0e572 100644
--- a/tests/heading_setext.rs
+++ b/tests/heading_setext.rs
@@ -298,7 +298,7 @@ fn heading_setext() -> Result<(), String> {
             children: vec![Node::Heading(Heading {
                 depth: 1,
                 children: vec![Node::Text(Text {
-                    value: "alpha\nbravo".to_string(),
+                    value: "alpha\nbravo".into(),
                     position: Some(Position::new(1, 1, 0, 2, 6, 11))
                 }),],
                 position: Some(Position::new(1, 1, 0, 3, 3, 14))
diff --git a/tests/html_flow.rs b/tests/html_flow.rs
index ca93510..adeebf6 100644
--- a/tests/html_flow.rs
+++ b/tests/html_flow.rs
@@ -52,7 +52,7 @@ fn html_flow() -> Result<(), String> {
         micromark_to_mdast("<div>\nstuff\n</div>", &ParseOptions::default())?,
         Node::Root(Root {
             children: vec![Node::Html(Html {
-                value: "<div>\nstuff\n</div>".to_string(),
+                value: "<div>\nstuff\n</div>".into(),
                 position: Some(Position::new(1, 1, 0, 3, 7, 18))
             })],
             position: Some(Position::new(1, 1, 0, 3, 7, 18))
diff --git a/tests/html_text.rs b/tests/html_text.rs
index bc36bd7..2bdd79d 100644
--- a/tests/html_text.rs
+++ b/tests/html_text.rs
@@ -451,23 +451,23 @@ micromark_with_options("<x> a", &danger)?,
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![
                     Node::Text(Text {
-                        value: "alpha ".to_string(),
+                        value: "alpha ".into(),
                         position: Some(Position::new(1, 1, 0, 1, 7, 6))
                     }),
                     Node::Html(Html {
-                        value: "<i>".to_string(),
+                        value: "<i>".into(),
                         position: Some(Position::new(1, 7, 6, 1, 10, 9))
                     }),
                     Node::Text(Text {
-                        value: "bravo".to_string(),
+                        value: "bravo".into(),
                         position: Some(Position::new(1, 10, 9, 1, 15, 14))
                     }),
                     Node::Html(Html {
-                        value: "</b>".to_string(),
+                        value: "</b>".into(),
                         position: Some(Position::new(1, 15, 14, 1, 19, 18))
                     }),
                     Node::Text(Text {
-                        value: " charlie.".to_string(),
+                        value: " charlie.".into(),
                         position: Some(Position::new(1, 19, 18, 1, 28, 27))
                     })
                 ],
diff --git a/tests/image.rs b/tests/image.rs
index f52025d..7b58e6d 100644
--- a/tests/image.rs
+++ b/tests/image.rs
@@ -245,27 +245,27 @@ fn image() -> Result<(), String> {
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![
                     Node::Text(Text {
-                        value: "a ".to_string(),
+                        value: "a ".into(),
                         position: Some(Position::new(1, 1, 0, 1, 3, 2))
                     }),
                     Node::Image(Image {
-                        alt: "alpha".to_string(),
+                        alt: "alpha".into(),
                         url: String::new(),
                         title: None,
                         position: Some(Position::new(1, 3, 2, 1, 13, 12))
                     }),
                     Node::Text(Text {
-                        value: " b ".to_string(),
+                        value: " b ".into(),
                         position: Some(Position::new(1, 13, 12, 1, 16, 15))
                     }),
                     Node::Image(Image {
-                        alt: "bravo".to_string(),
-                        url: "charlie".to_string(),
-                        title: Some("delta".to_string()),
+                        alt: "bravo".into(),
+                        url: "charlie".into(),
+                        title: Some("delta".into()),
                         position: Some(Position::new(1, 16, 15, 1, 41, 40))
                     }),
                     Node::Text(Text {
-                        value: " c.".to_string(),
+                        value: " c.".into(),
                         position: Some(Position::new(1, 41, 40, 1, 44, 43))
                     })
                 ],
@@ -284,49 +284,49 @@ fn image() -> Result<(), String> {
         Node::Root(Root {
             children: vec![
                 Node::Definition(Definition {
-                    identifier: "x".to_string(),
-                    label: Some("x".to_string()),
-                    url: "y".to_string(),
+                    identifier: "x".into(),
+                    label: Some("x".into()),
+                    url: "y".into(),
                     title: None,
                     position: Some(Position::new(1, 1, 0, 1, 7, 6))
                 }),
                 Node::Paragraph(Paragraph {
                     children: vec![
                         Node::Text(Text {
-                            value: "a ".to_string(),
+                            value: "a ".into(),
                             position: Some(Position::new(3, 1, 8, 3, 3, 10))
                         }),
                         Node::ImageReference(ImageReference {
                             reference_kind: ReferenceKind::Shortcut,
-                            identifier: "x".to_string(),
-                            label: Some("x".to_string()),
-                            alt: "x".to_string(),
+                            identifier: "x".into(),
+                            label: Some("x".into()),
+                            alt: "x".into(),
                             position: Some(Position::new(3, 3, 10, 3, 7, 14))
                         }),
                         Node::Text(Text {
-                            value: " b ".to_string(),
+                            value: " b ".into(),
                             position: Some(Position::new(3, 7, 14, 3, 10, 17))
                         }),
                         Node::ImageReference(ImageReference {
                             reference_kind: ReferenceKind::Collapsed,
-                            identifier: "x".to_string(),
-                            label: Some("x".to_string()),
-                            alt: "x".to_string(),
+                            identifier: "x".into(),
+                            label: Some("x".into()),
+                            alt: "x".into(),
                             position: Some(Position::new(3, 10, 17, 3, 16, 23))
                         }),
                         Node::Text(Text {
-                            value: " c ".to_string(),
+                            value: " c ".into(),
                             position: Some(Position::new(3, 16, 23, 3, 19, 26))
                         }),
                         Node::ImageReference(ImageReference {
                             reference_kind: ReferenceKind::Full,
-                            identifier: "x".to_string(),
-                            label: Some("x".to_string()),
-                            alt: "d".to_string(),
+                            identifier: "x".into(),
+                            label: Some("x".into()),
+                            alt: "d".into(),
                             position: Some(Position::new(3, 19, 26, 3, 26, 33))
                         }),
                         Node::Text(Text {
-                            value: " e.".to_string(),
+                            value: " e.".into(),
                             position: Some(Position::new(3, 26, 33, 3, 29, 36))
                         }),
                     ],
diff --git a/tests/link_reference.rs b/tests/link_reference.rs
index c21ca0b..5e00dab 100644
--- a/tests/link_reference.rs
+++ b/tests/link_reference.rs
@@ -436,58 +436,58 @@ fn link_reference() -> Result<(), String> {
         Node::Root(Root {
             children: vec![
                 Node::Definition(Definition {
-                    identifier: "x".to_string(),
-                    label: Some("x".to_string()),
-                    url: "y".to_string(),
+                    identifier: "x".into(),
+                    label: Some("x".into()),
+                    url: "y".into(),
                     title: None,
                     position: Some(Position::new(1, 1, 0, 1, 7, 6))
                 }),
                 Node::Paragraph(Paragraph {
                     children: vec![
                         Node::Text(Text {
-                            value: "a ".to_string(),
+                            value: "a ".into(),
                             position: Some(Position::new(3, 1, 8, 3, 3, 10))
                         }),
                         Node::LinkReference(LinkReference {
                             reference_kind: ReferenceKind::Shortcut,
-                            identifier: "x".to_string(),
-                            label: Some("x".to_string()),
+                            identifier: "x".into(),
+                            label: Some("x".into()),
                             children: vec![Node::Text(Text {
-                                value: "x".to_string(),
+                                value: "x".into(),
                                 position: Some(Position::new(3, 4, 11, 3, 5, 12))
                             }),],
                             position: Some(Position::new(3, 3, 10, 3, 6, 13))
                         }),
                         Node::Text(Text {
-                            value: " b ".to_string(),
+                            value: " b ".into(),
                             position: Some(Position::new(3, 6, 13, 3, 9, 16))
                         }),
                         Node::LinkReference(LinkReference {
                             reference_kind: ReferenceKind::Collapsed,
-                            identifier: "x".to_string(),
-                            label: Some("x".to_string()),
+                            identifier: "x".into(),
+                            label: Some("x".into()),
                             children: vec![Node::Text(Text {
-                                value: "x".to_string(),
+                                value: "x".into(),
                                 position: Some(Position::new(3, 10, 17, 3, 11, 18))
                             }),],
                             position: Some(Position::new(3, 9, 16, 3, 14, 21))
                         }),
                         Node::Text(Text {
-                            value: " c ".to_string(),
+                            value: " c ".into(),
                             position: Some(Position::new(3, 14, 21, 3, 17, 24))
                         }),
                         Node::LinkReference(LinkReference {
                             reference_kind: ReferenceKind::Full,
-                            identifier: "x".to_string(),
-                            label: Some("x".to_string()),
+                            identifier: "x".into(),
+                            label: Some("x".into()),
                             children: vec![Node::Text(Text {
-                                value: "d".to_string(),
+                                value: "d".into(),
                                 position: Some(Position::new(3, 18, 25, 3, 19, 26))
                             }),],
                             position: Some(Position::new(3, 17, 24, 3, 23, 30))
                         }),
                         Node::Text(Text {
-                            value: " e.".to_string(),
+                            value: " e.".into(),
                             position: Some(Position::new(3, 23, 30, 3, 26, 33))
                         }),
                     ],
diff --git a/tests/link_resource.rs b/tests/link_resource.rs
index 9f136ef..4554d86 100644
--- a/tests/link_resource.rs
+++ b/tests/link_resource.rs
@@ -475,33 +475,33 @@ fn link_resource() -> Result<(), String> {
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![
                     Node::Text(Text {
-                        value: "a ".to_string(),
+                        value: "a ".into(),
                         position: Some(Position::new(1, 1, 0, 1, 3, 2))
                     }),
                     Node::Link(Link {
                         url: String::new(),
                         title: None,
                         children: vec![Node::Text(Text {
-                            value: "alpha".to_string(),
+                            value: "alpha".into(),
                             position: Some(Position::new(1, 4, 3, 1, 9, 8))
                         }),],
                         position: Some(Position::new(1, 3, 2, 1, 12, 11))
                     }),
                     Node::Text(Text {
-                        value: " b ".to_string(),
+                        value: " b ".into(),
                         position: Some(Position::new(1, 12, 11, 1, 15, 14))
                     }),
                     Node::Link(Link {
-                        url: "charlie".to_string(),
-                        title: Some("delta".to_string()),
+                        url: "charlie".into(),
+                        title: Some("delta".into()),
                         children: vec![Node::Text(Text {
-                            value: "bravo".to_string(),
+                            value: "bravo".into(),
                             position: Some(Position::new(1, 16, 15, 1, 21, 20))
                         }),],
                         position: Some(Position::new(1, 15, 14, 1, 39, 38))
                     }),
                     Node::Text(Text {
-                        value: " c.".to_string(),
+                        value: " c.".into(),
                         position: Some(Position::new(1, 39, 38, 1, 42, 41))
                     })
                 ],
diff --git a/tests/list.rs b/tests/list.rs
index 560be82..88b7e52 100644
--- a/tests/list.rs
+++ b/tests/list.rs
@@ -602,7 +602,7 @@ fn list() -> Result<(), String> {
                     spread: false,
                     children: vec![Node::Paragraph(Paragraph {
                         children: vec![Node::Text(Text {
-                            value: "a".to_string(),
+                            value: "a".into(),
                             position: Some(Position::new(1, 3, 2, 1, 4, 3))
                         }),],
                         position: Some(Position::new(1, 3, 2, 1, 4, 3))
@@ -628,7 +628,7 @@ fn list() -> Result<(), String> {
                     spread: false,
                     children: vec![Node::Paragraph(Paragraph {
                         children: vec![Node::Text(Text {
-                            value: "a".to_string(),
+                            value: "a".into(),
                             position: Some(Position::new(1, 4, 3, 1, 5, 4))
                         }),],
                         position: Some(Position::new(1, 4, 3, 1, 5, 4))
@@ -656,14 +656,14 @@ fn list() -> Result<(), String> {
                         children: vec![
                             Node::Paragraph(Paragraph {
                                 children: vec![Node::Text(Text {
-                                    value: "a".to_string(),
+                                    value: "a".into(),
                                     position: Some(Position::new(1, 3, 2, 1, 4, 3))
                                 }),],
                                 position: Some(Position::new(1, 3, 2, 1, 4, 3))
                             }),
                             Node::Paragraph(Paragraph {
                                 children: vec![Node::Text(Text {
-                                    value: "b".to_string(),
+                                    value: "b".into(),
                                     position: Some(Position::new(3, 3, 7, 3, 4, 8))
                                 }),],
                                 position: Some(Position::new(3, 3, 7, 3, 4, 8))
@@ -676,7 +676,7 @@ fn list() -> Result<(), String> {
                         spread: false,
                         children: vec![Node::Paragraph(Paragraph {
                             children: vec![Node::Text(Text {
-                                value: "c".to_string(),
+                                value: "c".into(),
                                 position: Some(Position::new(4, 3, 11, 4, 4, 12))
                             }),],
                             position: Some(Position::new(4, 3, 11, 4, 4, 12))
diff --git a/tests/math_flow.rs b/tests/math_flow.rs
index 4665eef..1cf0f65 100644
--- a/tests/math_flow.rs
+++ b/tests/math_flow.rs
@@ -260,8 +260,8 @@ fn math_flow() -> Result<(), String> {
         micromark_to_mdast("$$extra\nabc\ndef\n$$", &math.parse)?,
         Node::Root(Root {
             children: vec![Node::Math(Math {
-                meta: Some("extra".to_string()),
-                value: "abc\ndef".to_string(),
+                meta: Some("extra".into()),
+                value: "abc\ndef".into(),
                 position: Some(Position::new(1, 1, 0, 4, 3, 18))
             })],
             position: Some(Position::new(1, 1, 0, 4, 3, 18))
diff --git a/tests/math_text.rs b/tests/math_text.rs
index 6282181..b4d64f8 100644
--- a/tests/math_text.rs
+++ b/tests/math_text.rs
@@ -214,15 +214,15 @@ fn math_text() -> Result<(), String> {
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![
                     Node::Text(Text {
-                        value: "a ".to_string(),
+                        value: "a ".into(),
                         position: Some(Position::new(1, 1, 0, 1, 3, 2))
                     }),
                     Node::InlineMath(InlineMath {
-                        value: "alpha".to_string(),
+                        value: "alpha".into(),
                         position: Some(Position::new(1, 3, 2, 1, 10, 9))
                     }),
                     Node::Text(Text {
-                        value: " b.".to_string(),
+                        value: " b.".into(),
                         position: Some(Position::new(1, 10, 9, 1, 13, 12))
                     })
                 ],
diff --git a/tests/mdx_esm.rs b/tests/mdx_esm.rs
index 31f493b..f6c2b4d 100644
--- a/tests/mdx_esm.rs
+++ b/tests/mdx_esm.rs
@@ -249,7 +249,7 @@ fn mdx_esm() -> Result<(), String> {
         micromark_to_mdast("import a from 'b'\nexport {a}", &swc.parse)?,
         Node::Root(Root {
             children: vec![Node::MdxjsEsm(MdxjsEsm {
-                value: "import a from 'b'\nexport {a}".to_string(),
+                value: "import a from 'b'\nexport {a}".into(),
                 position: Some(Position::new(1, 1, 0, 2, 11, 28)),
                 stops: vec![(0, 0), (17, 17), (18, 18)]
             })],
diff --git a/tests/mdx_expression_flow.rs b/tests/mdx_expression_flow.rs
index c9ff560..8217c94 100644
--- a/tests/mdx_expression_flow.rs
+++ b/tests/mdx_expression_flow.rs
@@ -93,7 +93,7 @@ fn mdx_expression_flow_agnostic() -> Result<(), String> {
         micromark_to_mdast("{alpha +\nbravo}", &mdx.parse)?,
         Node::Root(Root {
             children: vec![Node::MdxFlowExpression(MdxFlowExpression {
-                value: "alpha +\nbravo".to_string(),
+                value: "alpha +\nbravo".into(),
                 position: Some(Position::new(1, 1, 0, 2, 7, 15)),
                 stops: vec![(0, 1), (7, 8), (8, 9)]
             })],
diff --git a/tests/mdx_expression_text.rs b/tests/mdx_expression_text.rs
index 0aee081..e0f1f3f 100644
--- a/tests/mdx_expression_text.rs
+++ b/tests/mdx_expression_text.rs
@@ -208,16 +208,16 @@ fn mdx_expression_text_agnostic() -> Result<(), String> {
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![
                     Node::Text(Text {
-                        value: "a ".to_string(),
+                        value: "a ".into(),
                         position: Some(Position::new(1, 1, 0, 1, 3, 2))
                     }),
                     Node::MdxTextExpression(MdxTextExpression {
-                        value: "alpha".to_string(),
+                        value: "alpha".into(),
                         position: Some(Position::new(1, 3, 2, 1, 10, 9)),
                         stops: vec![(0, 3)]
                     }),
                     Node::Text(Text {
-                        value: " b.".to_string(),
+                        value: " b.".into(),
                         position: Some(Position::new(1, 10, 9, 1, 13, 12))
                     })
                 ],
diff --git a/tests/mdx_jsx_flow.rs b/tests/mdx_jsx_flow.rs
index 46d2559..5216c82 100644
--- a/tests/mdx_jsx_flow.rs
+++ b/tests/mdx_jsx_flow.rs
@@ -167,7 +167,7 @@ fn mdx_jsx_flow_essence() -> Result<(), String> {
                         spread: false,
                         children: vec![Node::Paragraph(Paragraph {
                             children: vec![Node::Text(Text {
-                                value: "a".to_string(),
+                                value: "a".into(),
                                 position: Some(Position::new(2, 5, 7, 2, 6, 8))
                             }),],
                             position: Some(Position::new(2, 5, 7, 2, 6, 8))
diff --git a/tests/mdx_jsx_text.rs b/tests/mdx_jsx_text.rs
index 22a701a..cf0201e 100644
--- a/tests/mdx_jsx_text.rs
+++ b/tests/mdx_jsx_text.rs
@@ -58,17 +58,17 @@ fn mdx_jsx_text_core() -> Result<(), String> {
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![
                     Node::Text(Text {
-                        value: "a ".to_string(),
+                        value: "a ".into(),
                         position: Some(Position::new(1, 1, 0, 1, 3, 2))
                     }),
                     Node::MdxJsxTextElement(MdxJsxTextElement {
-                        name: Some("b".to_string()),
+                        name: Some("b".into()),
                         attributes: vec![],
                         children: vec![],
                         position: Some(Position::new(1, 3, 2, 1, 8, 7))
                     }),
                     Node::Text(Text {
-                        value: " c.".to_string(),
+                        value: " c.".into(),
                         position: Some(Position::new(1, 8, 7, 1, 11, 10))
                     })
                 ],
@@ -85,17 +85,17 @@ fn mdx_jsx_text_core() -> Result<(), String> {
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![
                     Node::Text(Text {
-                        value: "a ".to_string(),
+                        value: "a ".into(),
                         position: Some(Position::new(1, 1, 0, 1, 3, 2))
                     }),
                     Node::MdxJsxTextElement(MdxJsxTextElement {
-                        name: Some("b".to_string()),
+                        name: Some("b".into()),
                         attributes: vec![],
                         children: vec![
                             Node::Emphasis(Emphasis {
                                 children: vec![
                                     Node::Text(Text {
-                                        value: "c".to_string(),
+                                        value: "c".into(),
                                         position: Some(Position::new(1, 7, 6, 1, 8, 7))
                                     }),
                                 ],
@@ -105,7 +105,7 @@ fn mdx_jsx_text_core() -> Result<(), String> {
                         position: Some(Position::new(1, 3, 2, 1, 13, 12))
                     }),
                     Node::Text(Text {
-                        value: " d.".to_string(),
+                        value: " d.".into(),
                         position: Some(Position::new(1, 13, 12, 1, 16, 15))
                     })
                 ],
@@ -122,13 +122,13 @@ fn mdx_jsx_text_core() -> Result<(), String> {
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![
                     Node::MdxJsxTextElement(MdxJsxTextElement {
-                        name: Some("a:b".to_string()),
+                        name: Some("a:b".into()),
                         attributes: vec![],
                         children: vec![],
                         position: Some(Position::new(1, 1, 0, 1, 8, 7))
                     }),
                     Node::Text(Text {
-                        value: ".".to_string(),
+                        value: ".".into(),
                         position: Some(Position::new(1, 8, 7, 1, 9, 8))
                     })
                 ],
@@ -145,13 +145,13 @@ fn mdx_jsx_text_core() -> Result<(), String> {
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![
                     Node::MdxJsxTextElement(MdxJsxTextElement {
-                        name: Some("a.b.c".to_string()),
+                        name: Some("a.b.c".into()),
                         attributes: vec![],
                         children: vec![],
                         position: Some(Position::new(1, 1, 0, 1, 10, 9))
                     }),
                     Node::Text(Text {
-                        value: ".".to_string(),
+                        value: ".".into(),
                         position: Some(Position::new(1, 10, 9, 1, 11, 10))
                     })
                 ],
@@ -168,16 +168,13 @@ fn mdx_jsx_text_core() -> Result<(), String> {
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![
                     Node::MdxJsxTextElement(MdxJsxTextElement {
-                        name: Some("a".to_string()),
-                        attributes: vec![AttributeContent::Expression(
-                            "...b".to_string(),
-                            vec![(0, 4)]
-                        )],
+                        name: Some("a".into()),
+                        attributes: vec![AttributeContent::Expression("...b".into(), vec![(0, 4)])],
                         children: vec![],
                         position: Some(Position::new(1, 1, 0, 1, 13, 12))
                     }),
                     Node::Text(Text {
-                        value: ".".to_string(),
+                        value: ".".into(),
                         position: Some(Position::new(1, 13, 12, 1, 14, 13))
                     })
                 ],
@@ -194,14 +191,14 @@ fn mdx_jsx_text_core() -> Result<(), String> {
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![
                     Node::MdxJsxTextElement(MdxJsxTextElement {
-                        name: Some("a".to_string()),
+                        name: Some("a".into()),
                         attributes: vec![
                             AttributeContent::Property(MdxJsxAttribute {
-                                name: "b".to_string(),
+                                name: "b".into(),
                                 value: None,
                             }),
                             AttributeContent::Property(MdxJsxAttribute {
-                                name: "c:d".to_string(),
+                                name: "c:d".into(),
                                 value: None,
                             })
                         ],
@@ -209,7 +206,7 @@ fn mdx_jsx_text_core() -> Result<(), String> {
                         position: Some(Position::new(1, 1, 0, 1, 12, 11))
                     }),
                     Node::Text(Text {
-                        value: ".".to_string(),
+                        value: ".".into(),
                         position: Some(Position::new(1, 12, 11, 1, 13, 12))
                     })
                 ],
@@ -226,29 +223,26 @@ fn mdx_jsx_text_core() -> Result<(), String> {
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![
                     Node::MdxJsxTextElement(MdxJsxTextElement {
-                        name: Some("a".to_string()),
+                        name: Some("a".into()),
                         attributes: vec![
                             AttributeContent::Property(MdxJsxAttribute {
-                                name: "b".to_string(),
-                                value: Some(AttributeValue::Literal("c".to_string())),
+                                name: "b".into(),
+                                value: Some(AttributeValue::Literal("c".into())),
                             }),
                             AttributeContent::Property(MdxJsxAttribute {
-                                name: "d".to_string(),
-                                value: Some(AttributeValue::Literal("e".to_string())),
+                                name: "d".into(),
+                                value: Some(AttributeValue::Literal("e".into())),
                             }),
                             AttributeContent::Property(MdxJsxAttribute {
-                                name: "f".to_string(),
-                                value: Some(AttributeValue::Expression(
-                                    "g".to_string(),
-                                    vec![(0, 18)]
-                                )),
+                                name: "f".into(),
+                                value: Some(AttributeValue::Expression("g".into(), vec![(0, 18)])),
                             }),
                         ],
                         children: vec![],
                         position: Some(Position::new(1, 1, 0, 1, 24, 23))
                     }),
                     Node::Text(Text {
-                        value: ".".to_string(),
+                        value: ".".into(),
                         position: Some(Position::new(1, 24, 23, 1, 25, 24))
                     })
                 ],
@@ -265,10 +259,10 @@ fn mdx_jsx_text_core() -> Result<(), String> {
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![
                     Node::MdxJsxTextElement(MdxJsxTextElement {
-                        name: Some("a".to_string()),
+                        name: Some("a".into()),
                         attributes: vec![
                             AttributeContent::Property(MdxJsxAttribute {
-                                name: "b".to_string(),
+                                name: "b".into(),
                                 value: Some(AttributeValue::Literal("\u{a0} & © Æ &Dcaron; ¾ &HilbertSpace; &DifferentialD; &ClockwiseContourIntegral; &ngE;".into())),
                             }),
                         ],
@@ -276,7 +270,7 @@ fn mdx_jsx_text_core() -> Result<(), String> {
                         position: Some(Position::new(1, 1, 0, 1, 120, 119))
                     }),
                     Node::Text(Text {
-                        value: ".".to_string(),
+                        value: ".".into(),
                         position: Some(Position::new(1, 120, 119, 1, 121, 120))
                     })
                 ],
@@ -296,14 +290,14 @@ fn mdx_jsx_text_core() -> Result<(), String> {
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![
                     Node::MdxJsxTextElement(MdxJsxTextElement {
-                        name: Some("a".to_string()),
+                        name: Some("a".into()),
                         attributes: vec![
                             AttributeContent::Property(MdxJsxAttribute {
-                                name: "b".to_string(),
+                                name: "b".into(),
                                 value: Some(AttributeValue::Literal("# Ӓ Ϡ �".into())),
                             }),
                             AttributeContent::Property(MdxJsxAttribute {
-                                name: "c".to_string(),
+                                name: "c".into(),
                                 value: Some(AttributeValue::Literal("\" ആ ಫ".into())),
                             }),
                         ],
@@ -311,7 +305,7 @@ fn mdx_jsx_text_core() -> Result<(), String> {
                         position: Some(Position::new(1, 1, 0, 1, 63, 62))
                     }),
                     Node::Text(Text {
-                        value: ".".to_string(),
+                        value: ".".into(),
                         position: Some(Position::new(1, 63, 62, 1, 64, 63))
                     })
                 ],
@@ -328,10 +322,10 @@ fn mdx_jsx_text_core() -> Result<(), String> {
             children: vec![Node::Paragraph(Paragraph {
                 children: vec![
                     Node::MdxJsxTextElement(MdxJsxTextElement {
-                        name: Some("a".to_string()),
+                        name: Some("a".into()),
                         attributes: vec![
                             AttributeContent::Property(MdxJsxAttribute {
-                                name: "b".to_string(),
+                                name: "b".into(),
                                 value: Some(AttributeValue::Literal("&nbsp &x; &#; &#x; &#987654321; &#abcdef0; &ThisIsNotDefined; &hi?;".into())),
                             })
                         ],
@@ -339,7 +333,7 @@ fn mdx_jsx_text_core() -> Result<(), String> {
                         position: Some(Position::new(1, 1, 0, 1, 78, 77))
                     }),
                     Node::Text(Text {
-                        value: ".".to_string(),
+                        value: ".".into(),
                         position: Some(Position::new(1, 78, 77, 1, 79, 78))
                     })
                 ],
diff --git a/tests/test_utils/hast.rs b/tests/test_utils/hast.rs
index 48460ca..db5326c 100644
--- a/tests/test_utils/hast.rs
+++ b/tests/test_utils/hast.rs
@@ -68,7 +68,7 @@ impl ToString for Node {
             Node::MdxExpression(x) => x.value.clone(),
             Node::MdxjsEsm(x) => x.value.clone(),
             // Voids.
-            Node::Doctype(_) => "".to_string(),
+            Node::Doctype(_) => "".into(),
         }
     }
 }
diff --git a/tests/test_utils/swc.rs b/tests/test_utils/swc.rs
index 78859b6..7e44898 100644
--- a/tests/test_utils/swc.rs
+++ b/tests/test_utils/swc.rs
@@ -19,7 +19,7 @@ use swc_ecma_visit::VisitMutWith;
 /// Lex ESM in MDX with SWC.
 #[allow(dead_code)]
 pub fn parse_esm(value: &str) -> MdxSignal {
-    let (file, syntax, version) = create_config(value.to_string());
+    let (file, syntax, version) = create_config(value.into());
     let mut errors = vec![];
     let result = parse_file_as_module(&file, syntax, version, None, &mut errors);
 
@@ -43,7 +43,7 @@ pub fn parse_esm_to_tree(
     stops: &[Stop],
     location: Option<&Location>,
 ) -> Result<swc_ecma_ast::Module, String> {
-    let (file, syntax, version) = create_config(value.to_string());
+    let (file, syntax, version) = create_config(value.into());
     let mut errors = vec![];
     let result = parse_file_as_module(&file, syntax, version, None, &mut errors);
     let mut rewrite_context = RewriteContext {
@@ -210,7 +210,7 @@ pub fn serialize(module: &Module) -> String {
         emitter.emit_module(module).unwrap();
     }
 
-    String::from_utf8_lossy(&buf).to_string()
+    String::from_utf8_lossy(&buf).into()
 }
 
 /// Check that the resulting AST of ESM is OK.
@@ -225,7 +225,7 @@ fn check_esm_ast(tree: &Module) -> MdxSignal {
         if !node.is_module_decl() {
             let relative = fix_swc_position(node.span().lo.to_usize(), 0);
             return MdxSignal::Error(
-                "Unexpected statement in code: only import/exports are supported".to_string(),
+                "Unexpected statement in code: only import/exports are supported".into(),
                 relative,
             );
         }
@@ -253,10 +253,7 @@ fn check_expression_ast(tree: &Expr, kind: &MdxExpressionKind) -> MdxSignal {
             })
             .is_none()
     {
-        MdxSignal::Error(
-            "Expected a single spread value, such as `...x`".to_string(),
-            0,
-        )
+        MdxSignal::Error("Expected a single spread value, such as `...x`".into(), 0)
     } else {
         MdxSignal::Ok
     }
@@ -360,8 +357,7 @@ fn whitespace_and_comments(mut index: usize, value: &str) -> MdxSignal {
         // Outside comment, not whitespace.
         else {
             return MdxSignal::Error(
-                "Could not parse expression with swc: Unexpected content after expression"
-                    .to_string(),
+                "Could not parse expression with swc: Unexpected content after expression".into(),
                 index,
             );
         }
@@ -371,14 +367,14 @@ fn whitespace_and_comments(mut index: usize, value: &str) -> MdxSignal {
 
     if in_multiline {
         MdxSignal::Error(
-            "Could not parse expression with swc: Unexpected unclosed multiline comment, expected closing: `*/`".to_string(),
+            "Could not parse expression with swc: Unexpected unclosed multiline comment, expected closing: `*/`".into(),
             index,
         )
     } else if in_line {
         // EOF instead of EOL is specifically not allowed, because that would
         // mean the closing brace is on the commented-out line
         MdxSignal::Error(
-            "Could not parse expression with swc: Unexpected unclosed line comment, expected line ending: `\\n`".to_string(),
+            "Could not parse expression with swc: Unexpected unclosed line comment, expected line ending: `\\n`".into(),
             index,
         )
     } else {