Fix whitespace in GFM footnote definition identifiers

*   Fix a crash on line endings in footnote definitions
*   Fix to match spaces and tabs in identifiers to `cmark-gfm`
*   Fix order of one attribute

5 files changed, 126 insertions, 33 deletions

diff --git a/src/compiler.rs b/src/compiler.rs
index 1f029f5..397e96f 100644
--- a/src/compiler.rs
+++ b/src/compiler.rs
@@ -1828,15 +1828,13 @@ fn generate_footnote_item(context: &mut CompileContext, index: usize) {
             backreferences.push('-');
             backreferences.push_str(&(reference_index + 1).to_string());
         }
-        backreferences.push_str(
-            "\" data-footnote-backref=\"\" class=\"data-footnote-backref\" aria-label=\"",
-        );
+        backreferences.push_str("\" data-footnote-backref=\"\" aria-label=\"");
         if let Some(ref value) = context.options.gfm_footnote_back_label {
             backreferences.push_str(&encode(value, context.encode_html));
         } else {
             backreferences.push_str("Back to content");
         }
-        backreferences.push_str("\">↩");
+        backreferences.push_str("\" class=\"data-footnote-backref\">↩");
         if reference_index != 0 {
             backreferences.push_str("<sup>");
             backreferences.push_str(&(reference_index + 1).to_string());
diff --git a/src/construct/document.rs b/src/construct/document.rs
index 57c5f3a..45a961d 100644
--- a/src/construct/document.rs
+++ b/src/construct/document.rs
@@ -567,11 +567,20 @@ fn resolve(tokenizer: &mut Tokenizer) {
 
     child.map.consume(&mut child.events);
 
+    let mut flow_index = skip::to(&tokenizer.events, 0, &[Name::Data]);
+    while flow_index < tokenizer.events.len()
+        // To do: use `!is_some_and()` when that’s stable.
+        && (tokenizer.events[flow_index].link.is_none()
+            || tokenizer.events[flow_index].link.as_ref().unwrap().content != Content::Flow)
+    {
+        flow_index = skip::to(&tokenizer.events, flow_index + 1, &[Name::Data]);
+    }
+
     // Now, add all child events into our parent document tokenizer.
     divide_events(
         &mut tokenizer.map,
         &tokenizer.events,
-        skip::to(&tokenizer.events, 0, &[Name::Data]),
+        flow_index,
         &mut child.events,
     );
 
diff --git a/src/construct/gfm_footnote_definition.rs b/src/construct/gfm_footnote_definition.rs
index cbe816f..d3f72d7 100644
--- a/src/construct/gfm_footnote_definition.rs
+++ b/src/construct/gfm_footnote_definition.rs
@@ -127,6 +127,8 @@
 //!     — while `CommonMark` prevents links in links, GitHub does not prevent footnotes (which turn into links) in links
 //! *   [Footnote-like brackets around image, break that image](https://github.com/github/cmark-gfm/issues/275)\
 //!     — images can’t be used in what looks like a footnote call
+//! *   [GFM footnotes: line ending in footnote definition label causes text to disappear](https://github.com/github/cmark-gfm/issues/282)\
+//!     — line endings in footnote definitions cause text to disappear
 //!
 //! ## Tokens
 //!
@@ -164,11 +166,11 @@
 //! [html_sup]: https://html.spec.whatwg.org/multipage/text-level-semantics.html#the-sub-and-sup-elements
 
 use crate::construct::partial_space_or_tab::space_or_tab_min_max;
-use crate::event::Name;
+use crate::event::{Content, Link, Name};
 use crate::state::{Name as StateName, State};
 use crate::tokenizer::Tokenizer;
 use crate::util::{
-    constant::TAB_SIZE,
+    constant::{LINK_REFERENCE_SIZE_MAX, TAB_SIZE},
     normalize_identifier::normalize_identifier,
     skip,
     slice::{Position, Slice},
@@ -220,22 +222,104 @@ pub fn start(tokenizer: &mut Tokenizer) -> State {
 pub fn label_before(tokenizer: &mut Tokenizer) -> State {
     match tokenizer.current {
         Some(b'[') => {
-            tokenizer.tokenize_state.token_1 = Name::GfmFootnoteDefinitionLabel;
-            tokenizer.tokenize_state.token_2 = Name::GfmFootnoteDefinitionLabelMarker;
-            tokenizer.tokenize_state.token_3 = Name::GfmFootnoteDefinitionLabelString;
-            tokenizer.tokenize_state.token_4 = Name::GfmFootnoteDefinitionMarker;
-            tokenizer.tokenize_state.marker = b'^';
             tokenizer.enter(Name::GfmFootnoteDefinitionPrefix);
-            tokenizer.attempt(
-                State::Next(StateName::GfmFootnoteDefinitionLabelAfter),
-                State::Nok,
-            );
-            State::Retry(StateName::LabelStart)
+            tokenizer.enter(Name::GfmFootnoteDefinitionLabel);
+            tokenizer.enter(Name::GfmFootnoteDefinitionLabelMarker);
+            tokenizer.consume();
+            tokenizer.exit(Name::GfmFootnoteDefinitionLabelMarker);
+            State::Next(StateName::GfmFootnoteDefinitionLabelAtMarker)
         }
         _ => State::Nok,
     }
 }
 
+/// In label, at caret.
+///
+/// ```markdown
+/// > | [^a]: b
+///      ^
+/// ```
+pub fn label_at_marker(tokenizer: &mut Tokenizer) -> State {
+    if tokenizer.current == Some(b'^') {
+        tokenizer.enter(Name::GfmFootnoteDefinitionMarker);
+        tokenizer.consume();
+        tokenizer.exit(Name::GfmFootnoteDefinitionMarker);
+        tokenizer.enter(Name::GfmFootnoteDefinitionLabelString);
+        tokenizer.enter_link(
+            Name::Data,
+            Link {
+                previous: None,
+                next: None,
+                content: Content::String,
+            },
+        );
+        State::Next(StateName::GfmFootnoteDefinitionLabelInside)
+    } else {
+        State::Nok
+    }
+}
+
+/// In label.
+///
+/// > 👉 **Note**: `cmark-gfm` prevents whitespace from occurring in footnote
+/// > definition labels.
+///
+/// ```markdown
+/// > | [^a]: b
+///       ^
+/// ```
+pub fn label_inside(tokenizer: &mut Tokenizer) -> State {
+    // Too long.
+    if tokenizer.tokenize_state.size > LINK_REFERENCE_SIZE_MAX
+        // Space or tab is not supported by GFM for some reason (`\n` and
+        // `[` make sense).
+        || matches!(tokenizer.current, None | Some(b'\t' | b'\n' | b' ' | b'['))
+        // Closing brace with nothing.
+        || (matches!(tokenizer.current, Some(b']')) && tokenizer.tokenize_state.size == 0)
+    {
+        tokenizer.tokenize_state.size = 0;
+        State::Nok
+    } else if matches!(tokenizer.current, Some(b']')) {
+        tokenizer.tokenize_state.size = 0;
+        tokenizer.exit(Name::Data);
+        tokenizer.exit(Name::GfmFootnoteDefinitionLabelString);
+        tokenizer.enter(Name::GfmFootnoteDefinitionLabelMarker);
+        tokenizer.consume();
+        tokenizer.exit(Name::GfmFootnoteDefinitionLabelMarker);
+        tokenizer.exit(Name::GfmFootnoteDefinitionLabel);
+        State::Next(StateName::GfmFootnoteDefinitionLabelAfter)
+    } else {
+        let next = if matches!(tokenizer.current.unwrap(), b'\\') {
+            StateName::GfmFootnoteDefinitionLabelEscape
+        } else {
+            StateName::GfmFootnoteDefinitionLabelInside
+        };
+        tokenizer.consume();
+        tokenizer.tokenize_state.size += 1;
+        State::Next(next)
+    }
+}
+
+/// After `\`, at a special character.
+///
+/// > 👉 **Note**: `cmark-gfm` currently does not support escaped brackets:
+/// > <https://github.com/github/cmark-gfm/issues/240>
+///
+/// ```markdown
+/// > | [^a\*b]: c
+///         ^
+/// ```
+pub fn label_escape(tokenizer: &mut Tokenizer) -> State {
+    match tokenizer.current {
+        Some(b'[' | b'\\' | b']') => {
+            tokenizer.tokenize_state.size += 1;
+            tokenizer.consume();
+            State::Next(StateName::GfmFootnoteDefinitionLabelInside)
+        }
+        _ => State::Retry(StateName::GfmFootnoteDefinitionLabelInside),
+    }
+}
+
 /// After definition label.
 ///
 /// ```markdown
@@ -243,12 +327,6 @@ pub fn label_before(tokenizer: &mut Tokenizer) -> State {
 ///         ^
 /// ```
 pub fn label_after(tokenizer: &mut Tokenizer) -> State {
-    tokenizer.tokenize_state.token_1 = Name::Data;
-    tokenizer.tokenize_state.token_2 = Name::Data;
-    tokenizer.tokenize_state.token_3 = Name::Data;
-    tokenizer.tokenize_state.token_4 = Name::Data;
-    tokenizer.tokenize_state.marker = 0;
-
     match tokenizer.current {
         Some(b':') => {
             let end = skip::to_back(
diff --git a/src/lib.rs b/src/lib.rs
index 420b14d..47a125f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -584,7 +584,7 @@ pub struct Options {
     ///             ..Options::default()
     ///         }
     ///     )?,
-    ///     "<p><sup><a href=\"#user-content-fn-a\" id=\"user-content-fnref-a\" data-footnote-ref=\"\" aria-describedby=\"footnote-label\">1</a></sup></p>\n<section data-footnotes=\"\" class=\"footnotes\"><h2 id=\"footnote-label\" class=\"sr-only\">Footnotes</h2>\n<ol>\n<li id=\"user-content-fn-a\">\n<p>b <a href=\"#user-content-fnref-a\" data-footnote-backref=\"\" class=\"data-footnote-backref\" aria-label=\"Back to content\">↩</a></p>\n</li>\n</ol>\n</section>\n"
+    ///     "<p><sup><a href=\"#user-content-fn-a\" id=\"user-content-fnref-a\" data-footnote-ref=\"\" aria-describedby=\"footnote-label\">1</a></sup></p>\n<section data-footnotes=\"\" class=\"footnotes\"><h2 id=\"footnote-label\" class=\"sr-only\">Footnotes</h2>\n<ol>\n<li id=\"user-content-fn-a\">\n<p>b <a href=\"#user-content-fnref-a\" data-footnote-backref=\"\" aria-label=\"Back to content\" class=\"data-footnote-backref\">↩</a></p>\n</li>\n</ol>\n</section>\n"
     /// );
     ///
     /// // Pass `gfm_footnote_label` to use something else:
@@ -597,7 +597,7 @@ pub struct Options {
     ///             ..Options::default()
     ///         }
     ///     )?,
-    ///     "<p><sup><a href=\"#user-content-fn-a\" id=\"user-content-fnref-a\" data-footnote-ref=\"\" aria-describedby=\"footnote-label\">1</a></sup></p>\n<section data-footnotes=\"\" class=\"footnotes\"><h2 id=\"footnote-label\" class=\"sr-only\">Notes de bas de page</h2>\n<ol>\n<li id=\"user-content-fn-a\">\n<p>b <a href=\"#user-content-fnref-a\" data-footnote-backref=\"\" class=\"data-footnote-backref\" aria-label=\"Back to content\">↩</a></p>\n</li>\n</ol>\n</section>\n"
+    ///     "<p><sup><a href=\"#user-content-fn-a\" id=\"user-content-fnref-a\" data-footnote-ref=\"\" aria-describedby=\"footnote-label\">1</a></sup></p>\n<section data-footnotes=\"\" class=\"footnotes\"><h2 id=\"footnote-label\" class=\"sr-only\">Notes de bas de page</h2>\n<ol>\n<li id=\"user-content-fn-a\">\n<p>b <a href=\"#user-content-fnref-a\" data-footnote-backref=\"\" aria-label=\"Back to content\" class=\"data-footnote-backref\">↩</a></p>\n</li>\n</ol>\n</section>\n"
     /// );
     /// # Ok(())
     /// # }
@@ -623,7 +623,7 @@ pub struct Options {
     ///             ..Options::default()
     ///         }
     ///     )?,
-    ///     "<p><sup><a href=\"#user-content-fn-a\" id=\"user-content-fnref-a\" data-footnote-ref=\"\" aria-describedby=\"footnote-label\">1</a></sup></p>\n<section data-footnotes=\"\" class=\"footnotes\"><h2 id=\"footnote-label\" class=\"sr-only\">Footnotes</h2>\n<ol>\n<li id=\"user-content-fn-a\">\n<p>b <a href=\"#user-content-fnref-a\" data-footnote-backref=\"\" class=\"data-footnote-backref\" aria-label=\"Back to content\">↩</a></p>\n</li>\n</ol>\n</section>\n"
+    ///     "<p><sup><a href=\"#user-content-fn-a\" id=\"user-content-fnref-a\" data-footnote-ref=\"\" aria-describedby=\"footnote-label\">1</a></sup></p>\n<section data-footnotes=\"\" class=\"footnotes\"><h2 id=\"footnote-label\" class=\"sr-only\">Footnotes</h2>\n<ol>\n<li id=\"user-content-fn-a\">\n<p>b <a href=\"#user-content-fnref-a\" data-footnote-backref=\"\" aria-label=\"Back to content\" class=\"data-footnote-backref\">↩</a></p>\n</li>\n</ol>\n</section>\n"
     /// );
     ///
     /// // Pass `gfm_footnote_label_tag_name` to use something else:
@@ -636,7 +636,7 @@ pub struct Options {
     ///             ..Options::default()
     ///         }
     ///     )?,
-    ///     "<p><sup><a href=\"#user-content-fn-a\" id=\"user-content-fnref-a\" data-footnote-ref=\"\" aria-describedby=\"footnote-label\">1</a></sup></p>\n<section data-footnotes=\"\" class=\"footnotes\"><h1 id=\"footnote-label\" class=\"sr-only\">Footnotes</h1>\n<ol>\n<li id=\"user-content-fn-a\">\n<p>b <a href=\"#user-content-fnref-a\" data-footnote-backref=\"\" class=\"data-footnote-backref\" aria-label=\"Back to content\">↩</a></p>\n</li>\n</ol>\n</section>\n"
+    ///     "<p><sup><a href=\"#user-content-fn-a\" id=\"user-content-fnref-a\" data-footnote-ref=\"\" aria-describedby=\"footnote-label\">1</a></sup></p>\n<section data-footnotes=\"\" class=\"footnotes\"><h1 id=\"footnote-label\" class=\"sr-only\">Footnotes</h1>\n<ol>\n<li id=\"user-content-fn-a\">\n<p>b <a href=\"#user-content-fnref-a\" data-footnote-backref=\"\" aria-label=\"Back to content\" class=\"data-footnote-backref\">↩</a></p>\n</li>\n</ol>\n</section>\n"
     /// );
     /// # Ok(())
     /// # }
@@ -668,7 +668,7 @@ pub struct Options {
     ///             ..Options::default()
     ///         }
     ///     )?,
-    ///     "<p><sup><a href=\"#user-content-fn-a\" id=\"user-content-fnref-a\" data-footnote-ref=\"\" aria-describedby=\"footnote-label\">1</a></sup></p>\n<section data-footnotes=\"\" class=\"footnotes\"><h2 id=\"footnote-label\" class=\"sr-only\">Footnotes</h2>\n<ol>\n<li id=\"user-content-fn-a\">\n<p>b <a href=\"#user-content-fnref-a\" data-footnote-backref=\"\" class=\"data-footnote-backref\" aria-label=\"Back to content\">↩</a></p>\n</li>\n</ol>\n</section>\n"
+    ///     "<p><sup><a href=\"#user-content-fn-a\" id=\"user-content-fnref-a\" data-footnote-ref=\"\" aria-describedby=\"footnote-label\">1</a></sup></p>\n<section data-footnotes=\"\" class=\"footnotes\"><h2 id=\"footnote-label\" class=\"sr-only\">Footnotes</h2>\n<ol>\n<li id=\"user-content-fn-a\">\n<p>b <a href=\"#user-content-fnref-a\" data-footnote-backref=\"\" aria-label=\"Back to content\" class=\"data-footnote-backref\">↩</a></p>\n</li>\n</ol>\n</section>\n"
     /// );
     ///
     /// // Pass `gfm_footnote_label_attributes` to use something else:
@@ -681,7 +681,7 @@ pub struct Options {
     ///             ..Options::default()
     ///         }
     ///     )?,
-    ///     "<p><sup><a href=\"#user-content-fn-a\" id=\"user-content-fnref-a\" data-footnote-ref=\"\" aria-describedby=\"footnote-label\">1</a></sup></p>\n<section data-footnotes=\"\" class=\"footnotes\"><h2 id=\"footnote-label\" class=\"footnote-heading\">Footnotes</h2>\n<ol>\n<li id=\"user-content-fn-a\">\n<p>b <a href=\"#user-content-fnref-a\" data-footnote-backref=\"\" class=\"data-footnote-backref\" aria-label=\"Back to content\">↩</a></p>\n</li>\n</ol>\n</section>\n"
+    ///     "<p><sup><a href=\"#user-content-fn-a\" id=\"user-content-fnref-a\" data-footnote-ref=\"\" aria-describedby=\"footnote-label\">1</a></sup></p>\n<section data-footnotes=\"\" class=\"footnotes\"><h2 id=\"footnote-label\" class=\"footnote-heading\">Footnotes</h2>\n<ol>\n<li id=\"user-content-fn-a\">\n<p>b <a href=\"#user-content-fnref-a\" data-footnote-backref=\"\" aria-label=\"Back to content\" class=\"data-footnote-backref\">↩</a></p>\n</li>\n</ol>\n</section>\n"
     /// );
     /// # Ok(())
     /// # }
@@ -708,7 +708,7 @@ pub struct Options {
     ///             ..Options::default()
     ///         }
     ///     )?,
-    ///     "<p><sup><a href=\"#user-content-fn-a\" id=\"user-content-fnref-a\" data-footnote-ref=\"\" aria-describedby=\"footnote-label\">1</a></sup></p>\n<section data-footnotes=\"\" class=\"footnotes\"><h2 id=\"footnote-label\" class=\"sr-only\">Footnotes</h2>\n<ol>\n<li id=\"user-content-fn-a\">\n<p>b <a href=\"#user-content-fnref-a\" data-footnote-backref=\"\" class=\"data-footnote-backref\" aria-label=\"Back to content\">↩</a></p>\n</li>\n</ol>\n</section>\n"
+    ///     "<p><sup><a href=\"#user-content-fn-a\" id=\"user-content-fnref-a\" data-footnote-ref=\"\" aria-describedby=\"footnote-label\">1</a></sup></p>\n<section data-footnotes=\"\" class=\"footnotes\"><h2 id=\"footnote-label\" class=\"sr-only\">Footnotes</h2>\n<ol>\n<li id=\"user-content-fn-a\">\n<p>b <a href=\"#user-content-fnref-a\" data-footnote-backref=\"\" aria-label=\"Back to content\" class=\"data-footnote-backref\">↩</a></p>\n</li>\n</ol>\n</section>\n"
     /// );
     ///
     /// // Pass `gfm_footnote_back_label` to use something else:
@@ -721,7 +721,7 @@ pub struct Options {
     ///             ..Options::default()
     ///         }
     ///     )?,
-    ///     "<p><sup><a href=\"#user-content-fn-a\" id=\"user-content-fnref-a\" data-footnote-ref=\"\" aria-describedby=\"footnote-label\">1</a></sup></p>\n<section data-footnotes=\"\" class=\"footnotes\"><h2 id=\"footnote-label\" class=\"sr-only\">Footnotes</h2>\n<ol>\n<li id=\"user-content-fn-a\">\n<p>b <a href=\"#user-content-fnref-a\" data-footnote-backref=\"\" class=\"data-footnote-backref\" aria-label=\"Arrière\">↩</a></p>\n</li>\n</ol>\n</section>\n"
+    ///     "<p><sup><a href=\"#user-content-fn-a\" id=\"user-content-fnref-a\" data-footnote-ref=\"\" aria-describedby=\"footnote-label\">1</a></sup></p>\n<section data-footnotes=\"\" class=\"footnotes\"><h2 id=\"footnote-label\" class=\"sr-only\">Footnotes</h2>\n<ol>\n<li id=\"user-content-fn-a\">\n<p>b <a href=\"#user-content-fnref-a\" data-footnote-backref=\"\" aria-label=\"Arrière\" class=\"data-footnote-backref\">↩</a></p>\n</li>\n</ol>\n</section>\n"
     /// );
     /// # Ok(())
     /// # }
@@ -758,7 +758,7 @@ pub struct Options {
     ///             ..Options::default()
     ///         }
     ///     )?,
-    ///     "<p><sup><a href=\"#user-content-fn-a\" id=\"user-content-fnref-a\" data-footnote-ref=\"\" aria-describedby=\"footnote-label\">1</a></sup></p>\n<section data-footnotes=\"\" class=\"footnotes\"><h2 id=\"footnote-label\" class=\"sr-only\">Footnotes</h2>\n<ol>\n<li id=\"user-content-fn-a\">\n<p>b <a href=\"#user-content-fnref-a\" data-footnote-backref=\"\" class=\"data-footnote-backref\" aria-label=\"Back to content\">↩</a></p>\n</li>\n</ol>\n</section>\n"
+    ///     "<p><sup><a href=\"#user-content-fn-a\" id=\"user-content-fnref-a\" data-footnote-ref=\"\" aria-describedby=\"footnote-label\">1</a></sup></p>\n<section data-footnotes=\"\" class=\"footnotes\"><h2 id=\"footnote-label\" class=\"sr-only\">Footnotes</h2>\n<ol>\n<li id=\"user-content-fn-a\">\n<p>b <a href=\"#user-content-fnref-a\" data-footnote-backref=\"\" aria-label=\"Back to content\" class=\"data-footnote-backref\">↩</a></p>\n</li>\n</ol>\n</section>\n"
     /// );
     ///
     /// // Pass `gfm_footnote_clobber_prefix` to use something else:
@@ -771,7 +771,7 @@ pub struct Options {
     ///             ..Options::default()
     ///         }
     ///     )?,
-    ///     "<p><sup><a href=\"#fn-a\" id=\"fnref-a\" data-footnote-ref=\"\" aria-describedby=\"footnote-label\">1</a></sup></p>\n<section data-footnotes=\"\" class=\"footnotes\"><h2 id=\"footnote-label\" class=\"sr-only\">Footnotes</h2>\n<ol>\n<li id=\"fn-a\">\n<p>b <a href=\"#fnref-a\" data-footnote-backref=\"\" class=\"data-footnote-backref\" aria-label=\"Back to content\">↩</a></p>\n</li>\n</ol>\n</section>\n"
+    ///     "<p><sup><a href=\"#fn-a\" id=\"fnref-a\" data-footnote-ref=\"\" aria-describedby=\"footnote-label\">1</a></sup></p>\n<section data-footnotes=\"\" class=\"footnotes\"><h2 id=\"footnote-label\" class=\"sr-only\">Footnotes</h2>\n<ol>\n<li id=\"fn-a\">\n<p>b <a href=\"#fnref-a\" data-footnote-backref=\"\" aria-label=\"Back to content\" class=\"data-footnote-backref\">↩</a></p>\n</li>\n</ol>\n</section>\n"
     /// );
     /// # Ok(())
     /// # }
diff --git a/src/state.rs b/src/state.rs
index dcabbd7..1d15239 100644
--- a/src/state.rs
+++ b/src/state.rs
@@ -197,6 +197,9 @@ pub enum Name {
 
     GfmFootnoteDefinitionStart,
     GfmFootnoteDefinitionLabelBefore,
+    GfmFootnoteDefinitionLabelAtMarker,
+    GfmFootnoteDefinitionLabelInside,
+    GfmFootnoteDefinitionLabelEscape,
     GfmFootnoteDefinitionLabelAfter,
     GfmFootnoteDefinitionWhitespaceAfter,
     GfmFootnoteDefinitionContStart,
@@ -652,6 +655,11 @@ pub fn call(tokenizer: &mut Tokenizer, name: Name) -> State {
 
         Name::GfmFootnoteDefinitionStart => construct::gfm_footnote_definition::start,
         Name::GfmFootnoteDefinitionLabelBefore => construct::gfm_footnote_definition::label_before,
+        Name::GfmFootnoteDefinitionLabelAtMarker => {
+            construct::gfm_footnote_definition::label_at_marker
+        }
+        Name::GfmFootnoteDefinitionLabelInside => construct::gfm_footnote_definition::label_inside,
+        Name::GfmFootnoteDefinitionLabelEscape => construct::gfm_footnote_definition::label_escape,
         Name::GfmFootnoteDefinitionLabelAfter => construct::gfm_footnote_definition::label_after,
         Name::GfmFootnoteDefinitionWhitespaceAfter => {
             construct::gfm_footnote_definition::whitespace_after