diff options
Diffstat (limited to 'library/alloc/src/macros.rs')
| -rw-r--r-- | library/alloc/src/macros.rs | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/library/alloc/src/macros.rs b/library/alloc/src/macros.rs index d5ca5c4ed27..8c6a367869c 100644 --- a/library/alloc/src/macros.rs +++ b/library/alloc/src/macros.rs @@ -111,6 +111,7 @@ macro_rules! vec { /// # Examples /// /// ``` +/// # #![allow(unused_must_use)] /// format!("test"); // => "test" /// format!("hello {}", "world!"); // => "hello world!" /// format!("x = {}, y = {val}", 10, val = 30); // => "x = 10, y = 30" @@ -119,10 +120,13 @@ macro_rules! vec { /// ``` #[macro_export] #[stable(feature = "rust1", since = "1.0.0")] +#[allow_internal_unstable(hint_must_use, liballoc_internals)] #[cfg_attr(not(test), rustc_diagnostic_item = "format_macro")] macro_rules! format { - ($($arg:tt)*) => {{ - let res = $crate::fmt::format($crate::__export::format_args!($($arg)*)); - res - }} + ($($arg:tt)*) => { + $crate::__export::must_use({ + let res = $crate::fmt::format($crate::__export::format_args!($($arg)*)); + res + }) + } } |