pub struct Arm {
pub attrs: AttrVec,
pub pat: P<Pat>,
pub guard: Option<P<Expr>>,
pub body: Option<P<Expr>>,
pub span: Span,
pub id: NodeId,
pub is_placeholder: bool,
}
Expand description
An arm of a ‘match’.
E.g., 0..=10 => { println!("match!") }
as in
match 123 {
0..=10 => { println!("match!") },
_ => { println!("no match!") },
}
Fields§
§attrs: AttrVec
§pat: P<Pat>
Match arm pattern, e.g. 10
in match foo { 10 => {}, _ => {} }
.
guard: Option<P<Expr>>
Match arm guard, e.g. n > 10
in match foo { n if n > 10 => {}, _ => {} }
.
body: Option<P<Expr>>
Match arm body. Omitted if the pattern is a never pattern.
span: Span
§id: NodeId
§is_placeholder: bool
Trait Implementations§
source§impl HasAttrs for Arm
impl HasAttrs for Arm
source§const SUPPORTS_CUSTOM_INNER_ATTRS: bool = false
const SUPPORTS_CUSTOM_INNER_ATTRS: bool = false
This is
true
if this HasAttrs
might support ‘custom’ (proc-macro) inner
attributes. Attributes like #![cfg]
and #![cfg_attr]
are not
considered ‘custom’ attributes. Read morefn attrs(&self) -> &[Attribute]
fn visit_attrs(&mut self, f: impl FnOnce(&mut AttrVec))
source§impl HasTokens for Arm
impl HasTokens for Arm
fn tokens(&self) -> Option<&LazyAttrTokenStream>
fn tokens_mut(&mut self) -> Option<&mut Option<LazyAttrTokenStream>>
Auto Trait Implementations§
impl Freeze for Arm
impl !RefUnwindSafe for Arm
impl !Send for Arm
impl !Sync for Arm
impl Unpin for Arm
impl !UnwindSafe for Arm
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
source§impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
source§default unsafe fn clone_to_uninit(&self, dst: *mut T)
default unsafe fn clone_to_uninit(&self, dst: *mut T)
🔬This is a nightly-only experimental API. (
clone_to_uninit
)source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
Converts
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
Converts
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§impl<T> WithSubscriber for T
impl<T> WithSubscriber for T
source§fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
source§fn with_current_subscriber(self) -> WithDispatch<Self>
fn with_current_subscriber(self) -> WithDispatch<Self>
impl<'a, T> Captures<'a> for Twhere
T: ?Sized,
Layout§
Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...)
attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.
Size: 48 bytes