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Add known issue of let binding to format_args doc

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Antoine PLASKOWSKI
2023-05-02 20:36:48 +02:00
committed by Antoine
parent 9d795a6e6e
commit cd7c161294
1 changed files with 8 additions and 0 deletions
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8
library/core/src/macros/mod.rs
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@@ -868,6 +868,14 @@ pub(crate) mod builtin {
/// let s = fmt::format(format_args!("hello {}", "world")); /// let s = fmt::format(format_args!("hello {}", "world"));
/// assert_eq!(s, format!("hello {}", "world")); /// assert_eq!(s, format!("hello {}", "world"));
/// ``` /// ```
///
/// # Lifetime limitation
///
/// Except when no formatting arguments are used,
/// the produced `fmt::Arguments` value borrows temporary values,
/// which means it can only be used within the same expression
/// and cannot be stored for later use.
/// This is a known limitation, see [#92698](https://github.com/rust-lang/rust/issues/92698).
#[stable(feature = "rust1", since = "1.0.0")] #[stable(feature = "rust1", since = "1.0.0")]
#[cfg_attr(not(test), rustc_diagnostic_item = "format_args_macro")] #[cfg_attr(not(test), rustc_diagnostic_item = "format_args_macro")]
#[allow_internal_unsafe] #[allow_internal_unsafe]