Enum rustc_ast::ast::ExprKind

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pub enum ExprKind {
Show 45 variants Array(ThinVec<P<Expr>>), ConstBlock(AnonConst), Call(P<Expr>, ThinVec<P<Expr>>), MethodCall(Box<MethodCall>), Tup(ThinVec<P<Expr>>), Binary(BinOp, P<Expr>, P<Expr>), Unary(UnOp, P<Expr>), Lit(Lit), Cast(P<Expr>, P<Ty>), Type(P<Expr>, P<Ty>), Let(P<Pat>, P<Expr>, Span, Option<ErrorGuaranteed>), If(P<Expr>, P<Block>, Option<P<Expr>>), While(P<Expr>, P<Block>, Option<Label>), ForLoop { pat: P<Pat>, iter: P<Expr>, body: P<Block>, label: Option<Label>, kind: ForLoopKind, }, Loop(P<Block>, Option<Label>, Span), Match(P<Expr>, ThinVec<Arm>), Closure(Box<Closure>), Block(P<Block>, Option<Label>), Gen(CaptureBy, P<Block>, GenBlockKind), Await(P<Expr>, Span), TryBlock(P<Block>), Assign(P<Expr>, P<Expr>, Span), AssignOp(BinOp, P<Expr>, P<Expr>), Field(P<Expr>, Ident), Index(P<Expr>, P<Expr>, Span), Range(Option<P<Expr>>, Option<P<Expr>>, RangeLimits), Underscore, Path(Option<P<QSelf>>, Path), AddrOf(BorrowKind, Mutability, P<Expr>), Break(Option<Label>, Option<P<Expr>>), Continue(Option<Label>), Ret(Option<P<Expr>>), InlineAsm(P<InlineAsm>), OffsetOf(P<Ty>, P<[Ident]>), MacCall(P<MacCall>), Struct(P<StructExpr>), Repeat(P<Expr>, AnonConst), Paren(P<Expr>), Try(P<Expr>), Yield(Option<P<Expr>>), Yeet(Option<P<Expr>>), Become(P<Expr>), IncludedBytes(Lrc<[u8]>), FormatArgs(P<FormatArgs>), Err,
}

Variants§

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Array(ThinVec<P<Expr>>)

An array ([a, b, c, d])

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ConstBlock(AnonConst)

Allow anonymous constants from an inline const block

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Call(P<Expr>, ThinVec<P<Expr>>)

A function call

The first field resolves to the function itself, and the second field is the list of arguments. This also represents calling the constructor of tuple-like ADTs such as tuple structs and enum variants.

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MethodCall(Box<MethodCall>)

A method call (e.g. x.foo::<Bar, Baz>(a, b, c)).

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Tup(ThinVec<P<Expr>>)

A tuple (e.g., (a, b, c, d)).

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Binary(BinOp, P<Expr>, P<Expr>)

A binary operation (e.g., a + b, a * b).

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Unary(UnOp, P<Expr>)

A unary operation (e.g., !x, *x).

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Lit(Lit)

A literal (e.g., 1, "foo").

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Cast(P<Expr>, P<Ty>)

A cast (e.g., foo as f64).

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Type(P<Expr>, P<Ty>)

A type ascription (e.g., 42: usize).

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Let(P<Pat>, P<Expr>, Span, Option<ErrorGuaranteed>)

A let pat = expr expression that is only semantically allowed in the condition of if / while expressions. (e.g., if let 0 = x { .. }).

Span represents the whole let pat = expr statement.

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If(P<Expr>, P<Block>, Option<P<Expr>>)

An if block, with an optional else block.

if expr { block } else { expr }

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While(P<Expr>, P<Block>, Option<Label>)

A while loop, with an optional label.

'label: while expr { block }

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ForLoop

Fields

§pat: P<Pat>
§iter: P<Expr>
§body: P<Block>
§label: Option<Label>

A for loop, with an optional label.

'label: for await? pat in iter { block }

This is desugared to a combination of loop and match expressions.

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Loop(P<Block>, Option<Label>, Span)

Conditionless loop (can be exited with break, continue, or return).

'label: loop { block }

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Match(P<Expr>, ThinVec<Arm>)

A match block.

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Closure(Box<Closure>)

A closure (e.g., move |a, b, c| a + b + c).

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Block(P<Block>, Option<Label>)

A block ('label: { ... }).

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Gen(CaptureBy, P<Block>, GenBlockKind)

An async block (async move { ... }), or a gen block (gen move { ... })

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Await(P<Expr>, Span)

An await expression (my_future.await). Span is of await keyword.

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TryBlock(P<Block>)

A try block (try { ... }).

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Assign(P<Expr>, P<Expr>, Span)

An assignment (a = foo()). The Span argument is the span of the = token.

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AssignOp(BinOp, P<Expr>, P<Expr>)

An assignment with an operator.

E.g., a += 1.

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Field(P<Expr>, Ident)

Access of a named (e.g., obj.foo) or unnamed (e.g., obj.0) struct field.

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Index(P<Expr>, P<Expr>, Span)

An indexing operation (e.g., foo[2]). The span represents the span of the [2], including brackets.

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Range(Option<P<Expr>>, Option<P<Expr>>, RangeLimits)

A range (e.g., 1..2, 1.., ..2, 1..=2, ..=2; and .. in destructuring assignment).

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Underscore

An underscore, used in destructuring assignment to ignore a value.

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Path(Option<P<QSelf>>, Path)

Variable reference, possibly containing :: and/or type parameters (e.g., foo::bar::<baz>).

Optionally “qualified” (e.g., <Vec<T> as SomeTrait>::SomeType).

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AddrOf(BorrowKind, Mutability, P<Expr>)

A referencing operation (&a, &mut a, &raw const a or &raw mut a).

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Break(Option<Label>, Option<P<Expr>>)

A break, with an optional label to break, and an optional expression.

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Continue(Option<Label>)

A continue, with an optional label.

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Ret(Option<P<Expr>>)

A return, with an optional value to be returned.

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InlineAsm(P<InlineAsm>)

Output of the asm!() macro.

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OffsetOf(P<Ty>, P<[Ident]>)

Output of the offset_of!() macro.

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MacCall(P<MacCall>)

A macro invocation; pre-expansion.

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Struct(P<StructExpr>)

A struct literal expression.

E.g., Foo {x: 1, y: 2}, or Foo {x: 1, .. rest}.

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Repeat(P<Expr>, AnonConst)

An array literal constructed from one repeated element.

E.g., [1; 5]. The expression is the element to be repeated; the constant is the number of times to repeat it.

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Paren(P<Expr>)

No-op: used solely so we can pretty-print faithfully.

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Try(P<Expr>)

A try expression (expr?).

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Yield(Option<P<Expr>>)

A yield, with an optional value to be yielded.

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Yeet(Option<P<Expr>>)

A do yeet (aka throw/fail/bail/raise/whatever), with an optional value to be returned.

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Become(P<Expr>)

A tail call return, with the value to be returned.

While .0 must be a function call, we check this later, after parsing.

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IncludedBytes(Lrc<[u8]>)

Bytes included via include_bytes! Added for optimization purposes to avoid the need to escape large binary blobs - should always behave like ExprKind::Lit with a ByteStr literal.

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FormatArgs(P<FormatArgs>)

A format_args!() expression.

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Err

Placeholder for an expression that wasn’t syntactically well formed in some way.

Trait Implementations§

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impl Clone for ExprKind

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fn clone(&self) -> ExprKind

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 ExprKind

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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: SpanDecoder> Decodable<__D> for ExprKind

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

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impl<__E: SpanEncoder> Encodable<__E> for ExprKind

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

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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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, R> CollectAndApply<T, R> for T

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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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> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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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> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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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.
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<'a, T> Captures<'a> for T
where 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: 40 bytes

Size for each variant:

  • Array: 15 bytes
  • ConstBlock: 23 bytes
  • Call: 23 bytes
  • MethodCall: 15 bytes
  • Tup: 15 bytes
  • Binary: 31 bytes
  • Unary: 15 bytes
  • Lit: 15 bytes
  • Cast: 23 bytes
  • Type: 23 bytes
  • Let: 31 bytes
  • If: 31 bytes
  • While: 31 bytes
  • ForLoop: 39 bytes
  • Loop: 31 bytes
  • Match: 23 bytes
  • Closure: 15 bytes
  • Block: 23 bytes
  • Gen: 23 bytes
  • Await: 23 bytes
  • TryBlock: 15 bytes
  • Assign: 31 bytes
  • AssignOp: 31 bytes
  • Field: 23 bytes
  • Index: 31 bytes
  • Range: 23 bytes
  • Underscore: 0 bytes
  • Path: 39 bytes
  • AddrOf: 15 bytes
  • Break: 23 bytes
  • Continue: 15 bytes
  • Ret: 15 bytes
  • InlineAsm: 15 bytes
  • OffsetOf: 31 bytes
  • MacCall: 15 bytes
  • Struct: 15 bytes
  • Repeat: 31 bytes
  • Paren: 15 bytes
  • Try: 15 bytes
  • Yield: 15 bytes
  • Yeet: 15 bytes
  • Become: 15 bytes
  • IncludedBytes: 23 bytes
  • FormatArgs: 15 bytes
  • Err: 0 bytes