Struct rustc_ast::ast::Arm

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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§

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impl Clone for Arm

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fn clone(&self) -> Arm

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Arm

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<__D: Decoder> Decodable<__D> for Arm

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fn decode(__decoder: &mut __D) -> Self

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impl<__E: Encoder> Encodable<__E> for Arm

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fn encode(&self, __encoder: &mut __E)

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impl HasAttrs for Arm

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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 more
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fn attrs(&self) -> &[Attribute]

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fn visit_attrs(&mut self, f: impl FnOnce(&mut AttrVec))

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impl HasNodeId for Arm

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fn node_id(&self) -> NodeId

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fn node_id_mut(&mut self) -> &mut NodeId

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impl HasTokens for Arm

Auto Trait Implementations§

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impl !RefUnwindSafe for Arm

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impl !Send for Arm

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impl !Sync for Arm

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impl Unpin for Arm

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impl !UnwindSafe for Arm

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

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