Enum rustc::hir::ExprKind

pub enum ExprKind {
    Box(P<Expr>),
    Array(HirVec<Expr>),
    Call(P<Expr>, HirVec<Expr>),
    MethodCall(PathSegment, Span, HirVec<Expr>),
    Tup(HirVec<Expr>),
    Binary(BinOp, P<Expr>, P<Expr>),
    Unary(UnOp, P<Expr>),
    Lit(P<Lit>),
    Cast(P<Expr>, P<Ty>),
    Type(P<Expr>, P<Ty>),
    If(P<Expr>, P<Expr>, Option<P<Expr>>),
    While(P<Expr>, P<Block>, Option<Label>),
    Loop(P<Block>, Option<Label>, LoopSource),
    Match(P<Expr>, HirVec<Arm>, MatchSource),
    Closure(CaptureClause, P<FnDecl>, BodyId, Span, Option<GeneratorMovability>),
    Block(P<Block>, Option<Label>),
    Assign(P<Expr>, P<Expr>),
    AssignOp(BinOp, P<Expr>, P<Expr>),
    Field(P<Expr>, Ident),
    Index(P<Expr>, P<Expr>),
    Path(QPath),
    AddrOf(Mutability, P<Expr>),
    Break(Destination, Option<P<Expr>>),
    Continue(Destination),
    Ret(Option<P<Expr>>),
    InlineAsm(P<InlineAsm>, HirVec<Expr>, HirVec<Expr>),
    Struct(QPath, HirVec<Field>, Option<P<Expr>>),
    Repeat(P<Expr>, AnonConst),
    Yield(P<Expr>),
}

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Variants

Box(P<Expr>)

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A box x expression.

Array(HirVec<Expr>)

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

Call(P<Expr>, HirVec<Expr>)

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A function call

The first field resolves to the function itself (usually an ExprKind::Path), 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.

MethodCall(PathSegment, Span, HirVec<Expr>)

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A method call (x.foo::<'static, Bar, Baz>(a, b, c, d))

The PathSegment/Span represent the method name and its generic arguments (within the angle brackets). The first element of the vector of Exprs is the expression that evaluates to the object on which the method is being called on (the receiver), and the remaining elements are the rest of the arguments. Thus, x.foo::<Bar, Baz>(a, b, c, d) is represented as ExprKind::MethodCall(PathSegment { foo, [Bar, Baz] }, [x, a, b, c, d]).

Tup(HirVec<Expr>)

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A tuple ((a, b, c ,d))

Binary(BinOp, P<Expr>, P<Expr>)

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A binary operation (For example: a + b, a * b)

Unary(UnOp, P<Expr>)

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A unary operation (For example: !x, *x)

Lit(P<Lit>)

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A literal (For example: 1, "foo")

Cast(P<Expr>, P<Ty>)

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A cast (foo as f64)

Type(P<Expr>, P<Ty>)

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If(P<Expr>, P<Expr>, Option<P<Expr>>)

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An if block, with an optional else block

if expr { expr } else { expr }

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

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A while loop, with an optional label

'label: while expr { block }

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

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

'label: loop { block }

Match(P<Expr>, HirVec<Arm>, MatchSource)

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A match block, with a source that indicates whether or not it is the result of a desugaring, and if so, which kind.

Closure(CaptureClause, P<FnDecl>, BodyId, Span, Option<GeneratorMovability>)

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A closure (for example, move |a, b, c| {a + b + c}).

The final span is the span of the argument block |...|

This may also be a generator literal, indicated by the final boolean, in that case there is an GeneratorClause.

Block(P<Block>, Option<Label>)

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

Assign(P<Expr>, P<Expr>)

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An assignment (a = foo())

AssignOp(BinOp, P<Expr>, P<Expr>)

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An assignment with an operator

For example, a += 1.

Field(P<Expr>, Ident)

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Access of a named (obj.foo) or unnamed (obj.0) struct or tuple field

Index(P<Expr>, P<Expr>)

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An indexing operation (foo[2])

Path(QPath)

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Path to a definition, possibly containing lifetime or type parameters.

AddrOf(Mutability, P<Expr>)

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A referencing operation (&a or &mut a)

Break(Destination, Option<P<Expr>>)

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A break, with an optional label to break

Continue(Destination)

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A continue, with an optional label

Ret(Option<P<Expr>>)

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A return, with an optional value to be returned

InlineAsm(P<InlineAsm>, HirVec<Expr>, HirVec<Expr>)

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Inline assembly (from asm!), with its outputs and inputs.

Struct(QPath, HirVec<Field>, Option<P<Expr>>)

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A struct or struct-like variant literal expression.

For example, Foo {x: 1, y: 2}, or Foo {x: 1, .. base}, where base is the Option<Expr>.

Repeat(P<Expr>, AnonConst)

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An array literal constructed from one repeated element.

For example, [1; 5]. The first expression is the element to be repeated; the second is the number of times to repeat it.

Yield(P<Expr>)

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A suspension point for generators. This is yield <expr> in Rust.

Trait Implementations

impl Clone for ExprKind

fn clone(&self) -> ExprKind

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Encodable for ExprKind

fn encode<__S: Encoder>(&self, s: &mut __S) -> Result<(), __S::Error>

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impl Decodable for ExprKind

fn decode<__D: Decoder>(d: &mut __D) -> Result<ExprKind, __D::Error>

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impl Debug for ExprKind

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

Formats the value using the given formatter.

impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for ExprKind

fn hash_stable<W: StableHasherResult>(     &self,     __ctx: &mut StableHashingContext<'a>,     __hasher: &mut StableHasher<W> )

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