Enum syn::ExprKind

pub enum ExprKind {
    Box(Box<Expr>),
    InPlace(Box<Expr>, Box<Expr>),
    Array(Vec<Expr>),
    Call(Box<Expr>, Vec<Expr>),
    MethodCall(Ident, Vec<Ty>, Vec<Expr>),
    Tup(Vec<Expr>),
    Binary(BinOp, Box<Expr>, Box<Expr>),
    Unary(UnOp, Box<Expr>),
    Lit(Lit),
    Cast(Box<Expr>, Box<Ty>),
    Type(Box<Expr>, Box<Ty>),
    If(Box<Expr>, Block, Option<Box<Expr>>),
    IfLet(Box<Pat>, Box<Expr>, Block, Option<Box<Expr>>),
    While(Box<Expr>, Block, Option<Ident>),
    WhileLet(Box<Pat>, Box<Expr>, Block, Option<Ident>),
    ForLoop(Box<Pat>, Box<Expr>, Block, Option<Ident>),
    Loop(Block, Option<Ident>),
    Match(Box<Expr>, Vec<Arm>),
    Closure(CaptureBy, Box<FnDecl>, Box<Expr>),
    Block(Unsafety, Block),
    Assign(Box<Expr>, Box<Expr>),
    AssignOp(BinOp, Box<Expr>, Box<Expr>),
    Field(Box<Expr>, Ident),
    TupField(Box<Expr>, usize),
    Index(Box<Expr>, Box<Expr>),
    Range(Option<Box<Expr>>, Option<Box<Expr>>, RangeLimits),
    Path(Option<QSelf>, Path),
    AddrOf(Mutability, Box<Expr>),
    Break(Option<Ident>, Option<Box<Expr>>),
    Continue(Option<Ident>),
    Ret(Option<Box<Expr>>),
    Mac(Mac),
    Struct(Path, Vec<FieldValue>, Option<Box<Expr>>),
    Repeat(Box<Expr>, Box<Expr>),
    Paren(Box<Expr>),
    Try(Box<Expr>),
}

Variants

Box(Box<Expr>)

A box x expression.

InPlace(Box<Expr>, Box<Expr>)

First expr is the place; second expr is the value.

E.g. 'plae <- val'.

Array(Vec<Expr>)

An array, e.g. [a, b, c, d].

Call(Box<Expr>, Vec<Expr>)

A function call.

The first field resolves to the function itself, and the second field is the list of arguments

MethodCall(Ident, Vec<Ty>, Vec<Expr>)

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

The Ident is the identifier for the method name. The vector of Tys are the ascripted type parameters for the method (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(foo, [Bar, Baz], [x, a, b, c, d]).

Tup(Vec<Expr>)

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

Binary(BinOp, Box<Expr>, Box<Expr>)

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

Unary(UnOp, Box<Expr>)

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

Lit(Lit)

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

Cast(Box<Expr>, Box<Ty>)

A cast, e.g. foo as f64.

Type(Box<Expr>, Box<Ty>)

A type ascription, e.g. foo: f64.

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

An if block, with an optional else block

E.g., if expr { block } else { expr }

IfLet(Box<Pat>, Box<Expr>, Block, Option<Box<Expr>>)

An if let expression with an optional else block

E.g., if let pat = expr { block } else { expr }

This is desugared to a match expression.

While(Box<Expr>, Block, Option<Ident>)

A while loop, with an optional label

E.g., 'label: while expr { block }

WhileLet(Box<Pat>, Box<Expr>, Block, Option<Ident>)

A while-let loop, with an optional label.

E.g., 'label: while let pat = expr { block }

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

ForLoop(Box<Pat>, Box<Expr>, Block, Option<Ident>)

A for loop, with an optional label.

E.g., 'label: for pat in expr { block }

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

Loop(Block, Option<Ident>)

Conditionless loop with an optional label.

E.g. 'label: loop { block }

Match(Box<Expr>, Vec<Arm>)

A match block.

Closure(CaptureBy, Box<FnDecl>, Box<Expr>)

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

Block(Unsafety, Block)

A block ({ ... } or unsafe { ... })

Assign(Box<Expr>, Box<Expr>)

An assignment (a = foo())

AssignOp(BinOp, Box<Expr>, Box<Expr>)

An assignment with an operator

For example, a += 1.

Field(Box<Expr>, Ident)

Access of a named struct field (obj.foo)

TupField(Box<Expr>, usize)

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

For example, foo.0.

Index(Box<Expr>, Box<Expr>)

An indexing operation (foo[2])

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

A range (1..2, 1.., ..2, 1...2, 1..., ...2)

Path(Option<QSelf>, Path)

Variable reference, possibly containing :: and/or type parameters, e.g. foo::bar::.

Optionally "qualified", E.g. <Vec<T> as SomeTrait>::SomeType.

AddrOf(Mutability, Box<Expr>)

A referencing operation (&a or &mut a)

Break(Option<Ident>, Option<Box<Expr>>)

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

Continue(Option<Ident>)

A continue, with an optional label

Ret(Option<Box<Expr>>)

A return, with an optional value to be returned

Mac(Mac)

A macro invocation; pre-expansion

Struct(Path, Vec<FieldValue>, Option<Box<Expr>>)

A struct literal expression.

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

Repeat(Box<Expr>, Box<Expr>)

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.

Paren(Box<Expr>)

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

Try(Box<Expr>)

expr?

Trait Implementations

impl From<ExprKind> for Expr

fn from(node: ExprKind) -> Expr

Performs the conversion.

impl Debug for ExprKind

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

Formats the value using the given formatter.

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 Eq for ExprKind

impl PartialEq for ExprKind

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

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

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

This method tests for !=.

impl Hash for ExprKind

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].