diff options
| -rw-r--r-- | library/std/src/macros.rs | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/library/std/src/macros.rs b/library/std/src/macros.rs index 5a70aa070e8..e466f315152 100644 --- a/library/std/src/macros.rs +++ b/library/std/src/macros.rs @@ -282,6 +282,10 @@ macro_rules! eprintln { #[macro_export] #[stable(feature = "dbg_macro", since = "1.32.0")] macro_rules! dbg { + // NOTE: We cannot use `concat!` to make a static string as a format argument + // of `eprintln!` because `file!` could contain a `{` or + // `$val` expression could be a block (`{ .. }`), in which case the `eprintln!` + // will be malformed. () => { $crate::eprintln!("[{}:{}]", $crate::file!(), $crate::line!()); }; |