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Don't allow flattened format_args in const. #139624

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Don't allow flattened format_args in const. #139624

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9 changes: 8 additions & 1 deletion library/core/src/fmt/rt.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -174,8 +174,15 @@ impl Argument<'_> {
/// let f = format_args!("{}", "a");
/// println!("{f}");
/// ```
///
/// This function should _not_ be const, to make sure we don't accept
/// format_args!() and panic!() with arguments in const, even when not evaluated:
///
/// ```compile_fail,E0015
/// const _: () = if false { panic!("a {}", "a") };
/// ```
#[inline]
pub const fn none() -> [Self; 0] {
pub fn none() -> [Self; 0] {
[]
}
}
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