Enum rustc::hir::Expr_

pub enum Expr_ {
    ExprBox(P<Expr>),
    ExprArray(HirVec<Expr>),
    ExprCall(P<Expr>, HirVec<Expr>),
    ExprMethodCall(PathSegment, Span, HirVec<Expr>),
    ExprTup(HirVec<Expr>),
    ExprBinary(BinOp, P<Expr>, P<Expr>),
    ExprUnary(UnOp, P<Expr>),
    ExprLit(P<Lit>),
    ExprCast(P<Expr>, P<Ty>),
    ExprType(P<Expr>, P<Ty>),
    ExprIf(P<Expr>, P<Expr>, Option<P<Expr>>),
    ExprWhile(P<Expr>, P<Block>, Option<Spanned<Name>>),
    ExprLoop(P<Block>, Option<Spanned<Name>>, LoopSource),
    ExprMatch(P<Expr>, HirVec<Arm>, MatchSource),
    ExprClosure(CaptureClause, P<FnDecl>, BodyId, Span, bool),
    ExprBlock(P<Block>),
    ExprAssign(P<Expr>, P<Expr>),
    ExprAssignOp(BinOp, P<Expr>, P<Expr>),
    ExprField(P<Expr>, Spanned<Name>),
    ExprTupField(P<Expr>, Spanned<usize>),
    ExprIndex(P<Expr>, P<Expr>),
    ExprPath(QPath),
    ExprAddrOf(Mutability, P<Expr>),
    ExprBreak(Destination, Option<P<Expr>>),
    ExprAgain(Destination),
    ExprRet(Option<P<Expr>>),
    ExprInlineAsm(P<InlineAsm>, HirVec<Expr>, HirVec<Expr>),
    ExprStruct(QPath, HirVec<Field>, Option<P<Expr>>),
    ExprRepeat(P<Expr>, BodyId),
    ExprYield(P<Expr>),
}

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Variants

ExprBox(P<Expr>)

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A box x expression.

ExprArray(HirVec<Expr>)

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

ExprCall(P<Expr>, HirVec<Expr>)

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A function call

The first field resolves to the function itself (usually an ExprPath), 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.

ExprMethodCall(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]).

ExprTup(HirVec<Expr>)

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

ExprBinary(BinOp, P<Expr>, P<Expr>)

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

ExprUnary(UnOp, P<Expr>)

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

ExprLit(P<Lit>)

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

ExprCast(P<Expr>, P<Ty>)

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A cast (foo as f64)

ExprType(P<Expr>, P<Ty>)

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ExprIf(P<Expr>, P<Expr>, Option<P<Expr>>)

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An if block, with an optional else block

if expr { expr } else { expr }

ExprWhile(P<Expr>, P<Block>, Option<Spanned<Name>>)

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A while loop, with an optional label

'label: while expr { block }

ExprLoop(P<Block>, Option<Spanned<Name>>, LoopSource)

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

'label: loop { block }

ExprMatch(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.

ExprClosure(CaptureClause, P<FnDecl>, BodyId, Span, bool)

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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.

ExprBlock(P<Block>)

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A block ({ ... })

ExprAssign(P<Expr>, P<Expr>)

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An assignment (a = foo())

ExprAssignOp(BinOp, P<Expr>, P<Expr>)

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An assignment with an operator

For example, a += 1.

ExprField(P<Expr>, Spanned<Name>)

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Access of a named struct field (obj.foo)

ExprTupField(P<Expr>, Spanned<usize>)

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Access of an unnamed field of a struct or tuple-struct

For example, foo.0.

ExprIndex(P<Expr>, P<Expr>)

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An indexing operation (foo[2])

ExprPath(QPath)

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

ExprAddrOf(Mutability, P<Expr>)

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A referencing operation (&a or &mut a)

ExprBreak(Destination, Option<P<Expr>>)

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A break, with an optional label to break

ExprAgain(Destination)

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A continue, with an optional label

ExprRet(Option<P<Expr>>)

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A return, with an optional value to be returned

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

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

ExprStruct(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>.

ExprRepeat(P<Expr>, BodyId)

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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.

ExprYield(P<Expr>)

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

Trait Implementations

impl Clone for Expr_

fn clone(&self) -> Expr_

Returns a copy of the value.

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

Performs copy-assignment from source.

impl PartialEq for Expr_

fn eq(&self, __arg_0: &Expr_) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, __arg_0: &Expr_) -> bool

This method tests for !=.

impl Eq for Expr_

impl Encodable for Expr_

fn encode<__S: Encoder>(&self, __arg_0: &mut __S) -> Result<(), __S::Error>

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impl Decodable for Expr_

fn decode<__D: Decoder>(__arg_0: &mut __D) -> Result<Expr_, __D::Error>

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impl Hash for Expr_

fn hash<__H: Hasher>(&self, __arg_0: &mut __H)

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given [Hasher].

impl Debug for Expr_

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl<'tcx> HashStable<StableHashingContext<'tcx>> for Expr_

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

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