diff options
Diffstat (limited to 'src/libstd')
| -rw-r--r-- | src/libstd/macros.rs | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/src/libstd/macros.rs b/src/libstd/macros.rs index 49de9f80271..f06b8f621f2 100644 --- a/src/libstd/macros.rs +++ b/src/libstd/macros.rs @@ -217,10 +217,17 @@ macro_rules! eprint { /// ``` #[macro_export] #[stable(feature = "eprint", since = "1.19.0")] +#[allow_internal_unstable] macro_rules! eprintln { () => (eprint!("\n")); - ($fmt:expr) => (eprint!(concat!($fmt, "\n"))); - ($fmt:expr, $($arg:tt)*) => (eprint!(concat!($fmt, "\n"), $($arg)*)); + ($($arg:tt)*) => ({ + #[cfg(not(stage0))] { + ($crate::io::_eprint(format_args_nl!($($arg)*))); + } + #[cfg(stage0)] { + eprint!("{}\n", format_args!($($arg)*)) + } + }) } #[macro_export] |