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Auto merge of #86655 - jonas-schievink:const-arguments-as-str, r=kennytm

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Make `fmt::Arguments::as_str` unstably const

Motivation: mostly to move "panic!() in const contexts" forward, making use of `as_str` was mentioned in https://github.com/rust-lang/rust/issues/85194#issuecomment-852345377 and seems like the simplest way forward.
This commit is contained in:
bors 2021-06-27 15:45:29 +00:00
parent 49ba9361d8 b3fbfe474b
commit 9cdb2d3d59
1 changed files with 2 additions and 1 deletions
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3
library/core/src/fmt/mod.rs
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@ -444,8 +444,9 @@ impl<'a> Arguments<'a> {
/// assert_eq!(format_args!("{}", 1).as_str(), None);
/// ```
#[stable(feature = "fmt_as_str", since = "1.52.0")]
#[rustc_const_unstable(feature = "const_arguments_as_str", issue = "none")]
#[inline]
pub fn as_str(&self) -> Option<&'static str> {
pub const fn as_str(&self) -> Option<&'static str> {
match (self.pieces, self.args) {
([], []) => Some(""),
([s], []) => Some(s),