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Add new const_format_args!() macro and use it in panics.

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This commit is contained in:
Mara Bos 2021-07-09 16:45:50 +02:00
parent 76cf1b8bd0
commit b64c4f9560
9 changed files with 36 additions and 11 deletions
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10
library/core/src/macros/mod.rs
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@ -837,6 +837,16 @@ pub(crate) mod builtin {
($fmt:expr, $($args:tt)*) => {{ /* compiler built-in */ }};
}
/// Same as `format_args`, but can be used in some const contexts.
#[unstable(feature = "const_format_args", issue = "none")]
#[allow_internal_unstable(fmt_internals, const_fmt_arguments_new)]
#[rustc_builtin_macro]
#[macro_export]
macro_rules! const_format_args {
($fmt:expr) => {{ /* compiler built-in */ }};
($fmt:expr, $($args:tt)*) => {{ /* compiler built-in */ }};
}
/// Same as `format_args`, but adds a newline in the end.
#[unstable(
feature = "format_args_nl",