std::fmt::FormatterFn -> std::fmt::FromFn · patricklam/verify-rust-std@262a4f6 (original) (raw)
`@@ -1018,7 +1018,8 @@ impl<'a, 'b: 'a> DebugMap<'a, 'b> {
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`}
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`}
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/// Implements [fmt::Debug] and [fmt::Display] using a function.
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/// Creates a type whose [fmt::Debug] and [fmt::Display] impls are provided with the function
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/// f.
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`///
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`/// # Examples
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`///
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`@@ -1030,17 +1031,25 @@ impl<'a, 'b: 'a> DebugMap<'a, 'b> {
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`/// assert_eq!(format!("{}", value), "a");
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`/// assert_eq!(format!("{:?}", value), "'a'");
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`///
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/// let wrapped = fmt::FormatterFn(|f| write!(f, "{value:?}"));
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/// let wrapped = fmt::from_fn(|f| write!(f, "{value:?}"));
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`/// assert_eq!(format!("{}", wrapped), "'a'");
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`/// assert_eq!(format!("{:?}", wrapped), "'a'");
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```` /// ```
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`#[unstable(feature = "debug_closure_helpers", issue = "117729")]
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pub struct FormatterFn(pub F)
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pub fn from_fn<F: Fn(&mut fmt::Formatter<'_>) -> fmt::Result>(f: F) -> FromFn {
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FromFn(f)
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}
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/// Implements [fmt::Debug] and [fmt::Display] using a function.
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///
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/// Created with [from_fn].
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#[unstable(feature = "debug_closure_helpers", issue = "117729")]
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pub struct FromFn(F)
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`where
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`F: Fn(&mut fmt::Formatter<'_>) -> fmt::Result;
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`#[unstable(feature = "debug_closure_helpers", issue = "117729")]
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`-
impl fmt::Debug for FormatterFn
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impl fmt::Debug for FromFn
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`where
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`F: Fn(&mut fmt::Formatter<'_>) -> fmt::Result,
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`{
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`}
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`#[unstable(feature = "debug_closure_helpers", issue = "117729")]
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impl fmt::Display for FormatterFn
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impl fmt::Display for FromFn
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`where
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`F: Fn(&mut fmt::Formatter<'_>) -> fmt::Result,
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`{
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