pub enum ExprKind<'hir> {
Show 33 variants
ConstBlock(ConstBlock),
Array(&'hir [Expr<'hir>]),
Call(&'hir Expr<'hir>, &'hir [Expr<'hir>]),
MethodCall(&'hir PathSegment<'hir>, &'hir Expr<'hir>, &'hir [Expr<'hir>], Span),
Tup(&'hir [Expr<'hir>]),
Binary(BinOp, &'hir Expr<'hir>, &'hir Expr<'hir>),
Unary(UnOp, &'hir Expr<'hir>),
Lit(&'hir Lit),
Cast(&'hir Expr<'hir>, &'hir Ty<'hir>),
Type(&'hir Expr<'hir>, &'hir Ty<'hir>),
DropTemps(&'hir Expr<'hir>),
Let(&'hir Let<'hir>),
If(&'hir Expr<'hir>, &'hir Expr<'hir>, Option<&'hir Expr<'hir>>),
Loop(&'hir Block<'hir>, Option<Label>, LoopSource, Span),
Match(&'hir Expr<'hir>, &'hir [Arm<'hir>], MatchSource),
Closure(&'hir Closure<'hir>),
Block(&'hir Block<'hir>, Option<Label>),
Assign(&'hir Expr<'hir>, &'hir Expr<'hir>, Span),
AssignOp(BinOp, &'hir Expr<'hir>, &'hir Expr<'hir>),
Field(&'hir Expr<'hir>, Ident),
Index(&'hir Expr<'hir>, &'hir Expr<'hir>, Span),
Path(QPath<'hir>),
AddrOf(BorrowKind, Mutability, &'hir Expr<'hir>),
Break(Destination, Option<&'hir Expr<'hir>>),
Continue(Destination),
Ret(Option<&'hir Expr<'hir>>),
Become(&'hir Expr<'hir>),
InlineAsm(&'hir InlineAsm<'hir>),
OffsetOf(&'hir Ty<'hir>, &'hir [Ident]),
Struct(&'hir QPath<'hir>, &'hir [ExprField<'hir>], Option<&'hir Expr<'hir>>),
Repeat(&'hir Expr<'hir>, ArrayLen),
Yield(&'hir Expr<'hir>, YieldSource),
Err(ErrorGuaranteed),
}
Variants§
ConstBlock(ConstBlock)
Allow anonymous constants from an inline const
block
Array(&'hir [Expr<'hir>])
An array (e.g., [a, b, c, d]
).
Call(&'hir Expr<'hir>, &'hir [Expr<'hir>])
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(&'hir PathSegment<'hir>, &'hir Expr<'hir>, &'hir [Expr<'hir>], Span)
A method call (e.g., x.foo::<'static, Bar, Baz>(a, b, c, d)
).
The PathSegment
represents the method name and its generic arguments
(within the angle brackets).
The &Expr
is the expression that evaluates
to the object on which the method is being called on (the receiver),
and the &[Expr]
is 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], span)
.
The final Span
represents the span of the function and arguments
(e.g. foo::<Bar, Baz>(a, b, c, d)
in x.foo::<Bar, Baz>(a, b, c, d)
To resolve the called method to a DefId
, call type_dependent_def_id
with
the hir_id
of the MethodCall
node itself.
Tup(&'hir [Expr<'hir>])
A tuple (e.g., (a, b, c, d)
).
Binary(BinOp, &'hir Expr<'hir>, &'hir Expr<'hir>)
A binary operation (e.g., a + b
, a * b
).
Unary(UnOp, &'hir Expr<'hir>)
A unary operation (e.g., !x
, *x
).
Lit(&'hir Lit)
A literal (e.g., 1
, "foo"
).
Cast(&'hir Expr<'hir>, &'hir Ty<'hir>)
A cast (e.g., foo as f64
).
Type(&'hir Expr<'hir>, &'hir Ty<'hir>)
A type ascription (e.g., x: Foo
). See RFC 3307.
DropTemps(&'hir Expr<'hir>)
Wraps the expression in a terminating scope.
This makes it semantically equivalent to { let _t = expr; _t }
.
This construct only exists to tweak the drop order in HIR lowering.
An example of that is the desugaring of for
loops.
Let(&'hir Let<'hir>)
A let $pat = $expr
expression.
These are not Local
and only occur as expressions.
The let Some(x) = foo()
in if let Some(x) = foo()
is an example of Let(..)
.
If(&'hir Expr<'hir>, &'hir Expr<'hir>, Option<&'hir Expr<'hir>>)
An if
block, with an optional else block.
I.e., if <expr> { <expr> } else { <expr> }
.
Loop(&'hir Block<'hir>, Option<Label>, LoopSource, Span)
A conditionless loop (can be exited with break
, continue
, or return
).
I.e., 'label: loop { <block> }
.
The Span
is the loop header (for x in y
/while let pat = expr
).
Match(&'hir Expr<'hir>, &'hir [Arm<'hir>], MatchSource)
A match
block, with a source that indicates whether or not it is
the result of a desugaring, and if so, which kind.
Closure(&'hir Closure<'hir>)
A closure (e.g., move |a, b, c| {a + b + c}
).
The Span
is the argument block |...|
.
This may also be a generator literal or an async block
as indicated by the
Option<Movability>
.
Block(&'hir Block<'hir>, Option<Label>)
A block (e.g., 'label: { ... }
).
Assign(&'hir Expr<'hir>, &'hir Expr<'hir>, Span)
An assignment (e.g., a = foo()
).
AssignOp(BinOp, &'hir Expr<'hir>, &'hir Expr<'hir>)
An assignment with an operator.
E.g., a += 1
.
Field(&'hir Expr<'hir>, Ident)
Access of a named (e.g., obj.foo
) or unnamed (e.g., obj.0
) struct or tuple field.
Index(&'hir Expr<'hir>, &'hir Expr<'hir>, Span)
An indexing operation (foo[2]
).
Similar to ExprKind::MethodCall
, the final Span
represents the span of the brackets
and index.
Path(QPath<'hir>)
Path to a definition, possibly containing lifetime or type parameters.
AddrOf(BorrowKind, Mutability, &'hir Expr<'hir>)
A referencing operation (i.e., &a
or &mut a
).
Break(Destination, Option<&'hir Expr<'hir>>)
A break
, with an optional label to break.
Continue(Destination)
A continue
, with an optional label.
Ret(Option<&'hir Expr<'hir>>)
A return
, with an optional value to be returned.
Become(&'hir Expr<'hir>)
A become
, with the value to be returned.
InlineAsm(&'hir InlineAsm<'hir>)
Inline assembly (from asm!
), with its outputs and inputs.
OffsetOf(&'hir Ty<'hir>, &'hir [Ident])
Field offset (offset_of!
)
Struct(&'hir QPath<'hir>, &'hir [ExprField<'hir>], Option<&'hir Expr<'hir>>)
A struct or struct-like variant literal expression.
E.g., Foo {x: 1, y: 2}
, or Foo {x: 1, .. base}
,
where base
is the Option<Expr>
.
Repeat(&'hir Expr<'hir>, ArrayLen)
An array literal constructed from one repeated element.
E.g., [1; 5]
. The first expression is the element
to be repeated; the second is the number of times to repeat it.
Yield(&'hir Expr<'hir>, YieldSource)
A suspension point for generators (i.e., yield <expr>
).
Err(ErrorGuaranteed)
A placeholder for an expression that wasn’t syntactically well formed in some way.
Trait Implementations§
source§impl<'hir, __CTX> HashStable<__CTX> for ExprKind<'hir>where
__CTX: HashStableContext,
impl<'hir, __CTX> HashStable<__CTX> for ExprKind<'hir>where __CTX: HashStableContext,
fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)
impl<'hir> Copy for ExprKind<'hir>
Auto Trait Implementations§
impl<'hir> RefUnwindSafe for ExprKind<'hir>
impl<'hir> !Send for ExprKind<'hir>
impl<'hir> !Sync for ExprKind<'hir>
impl<'hir> Unpin for ExprKind<'hir>
impl<'hir> UnwindSafe for ExprKind<'hir>
Blanket Implementations§
source§impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for Twhere
T: Copy,
impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for Twhere T: Copy,
fn allocate_on<'a>(self, arena: &'a Arena<'tcx>) -> &'a mut T
fn allocate_from_iter<'a>( arena: &'a Arena<'tcx>, iter: impl IntoIterator<Item = T> ) -> &'a mut [T]
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
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
Size for each variant:
ConstBlock
: 23 bytesArray
: 23 bytesCall
: 31 bytesMethodCall
: 47 bytesTup
: 23 bytesBinary
: 31 bytesUnary
: 15 bytesLit
: 15 bytesCast
: 23 bytesType
: 23 bytesDropTemps
: 15 bytesLet
: 15 bytesIf
: 31 bytesLoop
: 31 bytesMatch
: 39 bytesClosure
: 15 bytesBlock
: 23 bytesAssign
: 31 bytesAssignOp
: 31 bytesField
: 23 bytesIndex
: 31 bytesPath
: 31 bytesAddrOf
: 15 bytesBreak
: 31 bytesContinue
: 23 bytesRet
: 15 bytesBecome
: 15 bytesInlineAsm
: 15 bytesOffsetOf
: 31 bytesStruct
: 39 bytesRepeat
: 31 bytesYield
: 23 bytesErr
: 0 bytes