Send debug output to stderr instead of stdout

2 files changed, 4 insertions, 2 deletions

diff --git a/README.md b/README.md
index cc0b49f..8e51642 100644
--- a/README.md
+++ b/README.md
@@ -142,6 +142,8 @@ The `print` key can take one of four values:
 * `code` (print the generated code)
 * `all` (print both parse tree and code)
 
+The resulting output will be printed to `stderr` during the compilation process.
+
 The parse tree looks like this for the example template:
 
 ```
diff --git a/askama_derive/src/lib.rs b/askama_derive/src/lib.rs
index 69cd686..f578d80 100644
--- a/askama_derive/src/lib.rs
+++ b/askama_derive/src/lib.rs
@@ -64,12 +64,12 @@ fn build_template(ast: &syn::DeriveInput) -> String {
     };
 
     if input.print == Print::Ast || input.print == Print::All {
-        println!("{:?}", parsed[&input.path]);
+        eprintln!("{:?}", parsed[&input.path]);
     }
 
     let code = generator::generate(&input, &contexts, &heritage);
     if input.print == Print::Code || input.print == Print::All {
-        println!("{}", code);
+        eprintln!("{}", code);
     }
     code
 }