[−][src]Enum syntax::ast::ExprKind
Variants
Box(P<Expr>)
A box x
expression.
ObsoleteInPlace(P<Expr>, P<Expr>)
First expr is the place; second expr is the value.
Array(Vec<P<Expr>>)
An array ([a, b, c, d]
)
Call(P<Expr>, Vec<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.
MethodCall(PathSegment, Vec<P<Expr>>)
A method call (x.foo::<'static, Bar, Baz>(a, b, c, d)
)
The PathSegment
represents the method name and its generic arguments
(within the angle brackets).
The first element of the vector of an Expr
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(Vec<P<Expr>>)
A tuple (e.g., (a, b, c, d)
).
Binary(BinOp, P<Expr>, P<Expr>)
A binary operation (e.g., a + b
, a * b
).
Unary(UnOp, P<Expr>)
A unary operation (e.g., !x
, *x
).
Lit(Lit)
A literal (e.g., 1
, "foo"
).
Cast(P<Expr>, P<Ty>)
A cast (e.g., foo as f64
).
Type(P<Expr>, P<Ty>)
If(P<Expr>, P<Block>, Option<P<Expr>>)
An if
block, with an optional else
block.
if expr { block } else { expr }
IfLet(Vec<P<Pat>>, P<Expr>, P<Block>, Option<P<Expr>>)
An if let
expression with an optional else block
if let pat = expr { block } else { expr }
This is desugared to a match
expression.
While(P<Expr>, P<Block>, Option<Label>)
A while loop, with an optional label
'label: while expr { block }
WhileLet(Vec<P<Pat>>, P<Expr>, P<Block>, Option<Label>)
A while let
loop, with an optional label.
'label: while let pat = expr { block }
This is desugared to a combination of loop
and match
expressions.
ForLoop(P<Pat>, P<Expr>, P<Block>, Option<Label>)
A for
loop, with an optional label.
'label: for pat in expr { block }
This is desugared to a combination of loop
and match
expressions.
Loop(P<Block>, Option<Label>)
Conditionless loop (can be exited with break
, continue
, or return
).
'label: loop { block }
Match(P<Expr>, Vec<Arm>)
A match
block.
Closure(CaptureBy, IsAsync, Movability, P<FnDecl>, P<Expr>, Span)
A closure (e.g., move |a, b, c| a + b + c
).
The final span is the span of the argument block |...|
.
Block(P<Block>, Option<Label>)
A block ('label: { ... }
).
Async(CaptureBy, NodeId, P<Block>)
An async block (async move { ... }
).
The NodeId
is the NodeId
for the closure that results from
desugaring an async block, just like the NodeId field in the
IsAsync
enum. This is necessary in order to create a def for the
closure which can be used as a parent of any child defs. Defs
created during lowering cannot be made the parent of any other
preexisting defs.
TryBlock(P<Block>)
A try block (try { ... }
).
Assign(P<Expr>, P<Expr>)
An assignment (a = foo()
).
AssignOp(BinOp, P<Expr>, P<Expr>)
An assignment with an operator.
E.g., a += 1
.
Field(P<Expr>, Ident)
Access of a named (e.g., obj.foo
) or unnamed (e.g., obj.0
) struct field.
Index(P<Expr>, P<Expr>)
An indexing operation (e.g., foo[2]
).
Range(Option<P<Expr>>, Option<P<Expr>>, RangeLimits)
A range (e.g., 1..2
, 1..
, ..2
, 1...2
, 1...
, ...2
).
Path(Option<QSelf>, Path)
Variable reference, possibly containing ::
and/or type
parameters (e.g., foo::bar::<baz>
).
Optionally "qualified" (e.g., <Vec<T> as SomeTrait>::SomeType
).
AddrOf(Mutability, P<Expr>)
A referencing operation (&a
or &mut a
).
Break(Option<Label>, Option<P<Expr>>)
A break
, with an optional label to break, and an optional expression.
Continue(Option<Label>)
A continue
, with an optional label.
Ret(Option<P<Expr>>)
A return
, with an optional value to be returned.
InlineAsm(P<InlineAsm>)
Output of the asm!()
macro.
Mac(Mac)
A macro invocation; pre-expansion.
Struct(Path, Vec<Field>, Option<P<Expr>>)
A struct literal expression.
E.g., Foo {x: 1, y: 2}
, or Foo {x: 1, .. base}
,
where base
is the Option<Expr>
.
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.
Paren(P<Expr>)
No-op: used solely so we can pretty-print faithfully.
Try(P<Expr>)
A try expression (expr?
).
Yield(Option<P<Expr>>)
A yield
, with an optional value to be yielded.
Err
Placeholder for an expression that wasn't syntactically well formed in some way.
Trait Implementations
impl Clone for ExprKind
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fn clone(&self) -> ExprKind
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fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source
. Read more
impl Debug for ExprKind
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impl Encodable for ExprKind
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impl Decodable for ExprKind
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Auto Trait Implementations
Blanket Implementations
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
fn to_owned(&self) -> T
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fn clone_into(&self, target: &mut T)
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impl<T> From for T
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impl<T, U> Into for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T> Borrow for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T, U> TryInto for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Encodable for T where
T: UseSpecializedEncodable + ?Sized,
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T: UseSpecializedEncodable + ?Sized,
impl<T> Decodable for T where
T: UseSpecializedDecodable,
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T: UseSpecializedDecodable,
impl<E> SpecializationError for E
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default fn not_found<S, T>(
trait_name: &'static str,
method_name: &'static str
) -> E where
T: ?Sized,
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trait_name: &'static str,
method_name: &'static str
) -> E where
T: ?Sized,
impl<T> Send for T where
T: ?Sized,
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T: ?Sized,
impl<T> Sync for T where
T: ?Sized,
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T: ?Sized,