pub enum TyKind {
Show 17 variants Slice(P<Ty>), Array(P<Ty>, AnonConst), Ptr(MutTy), Rptr(Option<Lifetime>, MutTy), BareFn(P<BareFnTy>), Never, Tup(Vec<P<Ty>>), Path(Option<QSelf>, Path), TraitObject(GenericBoundsTraitObjectSyntax), ImplTrait(NodeIdGenericBounds), Paren(P<Ty>), Typeof(AnonConst), Infer, ImplicitSelf, MacCall(MacCall), Err, CVarArgs,
Expand description

The various kinds of type recognized by the compiler.



A variable-length slice ([T]).

Array(P<Ty>, AnonConst)

A fixed length array ([T; n]).


A raw pointer (*const T or *mut T).

Rptr(Option<Lifetime>, MutTy)

A reference (&'a T or &'a mut T).


A bare function (e.g., fn(usize) -> bool).


The never type (!).


A tuple ((A, B, C, D,...)).

Path(Option<QSelf>, Path)

A path (module::module::...::Type), optionally “qualified”, e.g., <Vec<T> as SomeTrait>::SomeType.

Type parameters are stored in the Path itself.


A trait object type Bound1 + Bound2 + Bound3 where Bound is a trait or a lifetime.


An impl Bound1 + Bound2 + Bound3 type where Bound is a trait or a lifetime.

The NodeId exists to prevent lowering from having to generate NodeIds on the fly, which would complicate the generation of opaque type Foo = impl Trait items significantly.


No-op; kept solely so that we can pretty-print faithfully.


Unused for now.


This means the type should be inferred instead of it having been specified. This can appear anywhere in a type.


Inferred type of a self or &self argument in a method.


A macro in the type position.


Placeholder for a kind that has failed to be defined.


Placeholder for a va_list.


Trait Implementations

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

Uses borrowed data to replace owned data, usually by cloning. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.


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: 72 bytes

Size for each variant:

  • Slice: 15 bytes
  • Array: 31 bytes
  • Ptr: 23 bytes
  • Rptr: 39 bytes
  • BareFn: 15 bytes
  • Never: 0 bytes
  • Tup: 31 bytes
  • Path: 71 bytes
  • TraitObject: 31 bytes
  • ImplTrait: 31 bytes
  • Paren: 15 bytes
  • Typeof: 23 bytes
  • Infer: 0 bytes
  • ImplicitSelf: 0 bytes
  • MacCall: 71 bytes
  • Err: 0 bytes
  • CVarArgs: 0 bytes