Fix rustfmt warning

rustfmt.toml

@@ -14,7 +14,7 @@ reorder_imports = true
 reorder_modules = true
 remove_nested_parens = true
 match_arm_leading_pipes = "Never"
-fn_args_layout = "Tall"
+fn_params_layout = "Tall"
 edition = "2021"
 merge_derives = true
 use_try_shorthand = false

src/io/parser.rs

@@ -65,6 +65,8 @@ pub fn all_input_consumed<'a, T: 'a>(
 pub fn comment(input: Span) -> IntermediateResult<()> {
     alt((
         value((), pair(tag("%"), is_not("\n\r"))),
+        // a comment that immediately precedes the end of the line –
+        // this must come after the normal line comment above
         value((), tag("%")),
     ))(input)
 }