Enum rustc_hir::TyKind

source ·
pub enum TyKind<'hir> {
Show 13 variants Slice(&'hir Ty<'hir>), Array(&'hir Ty<'hir>, ArrayLen), Ptr(MutTy<'hir>), Rptr(&'hir LifetimeMutTy<'hir>), BareFn(&'hir BareFnTy<'hir>), Never, Tup(&'hir [Ty<'hir>]), Path(QPath<'hir>), OpaqueDef(ItemId, &'hir [GenericArg<'hir>], bool), TraitObject(&'hir [PolyTraitRef<'hir>], &'hir LifetimeTraitObjectSyntax), Typeof(AnonConst), Infer, Err,
Expand description

The various kinds of types recognized by the compiler.



Slice(&'hir Ty<'hir>)

A variable length slice (i.e., [T]).


Array(&'hir Ty<'hir>, ArrayLen)

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



A raw pointer (i.e., *const T or *mut T).


Rptr(&'hir LifetimeMutTy<'hir>)

A reference (i.e., &'a T or &'a mut T).


BareFn(&'hir BareFnTy<'hir>)

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



The never type (!).


Tup(&'hir [Ty<'hir>])

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



A path to a type definition (module::module::...::Type), or an associated type (e.g., <Vec<T> as Trait>::Type or <T>::Target).

Type parameters may be stored in each PathSegment.


OpaqueDef(ItemId, &'hir [GenericArg<'hir>], bool)

An opaque type definition itself. This is only used for impl Trait.

The generic argument list contains the lifetimes (and in the future possibly parameters) that are actually bound on the impl Trait.

The last parameter specifies whether this opaque appears in a trait definition.


TraitObject(&'hir [PolyTraitRef<'hir>], &'hir LifetimeTraitObjectSyntax)

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



Unused for now.



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



Placeholder for a type that has failed to be defined.

Trait Implementations§

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 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: 32 bytes

Size for each variant:

  • Slice: 15 bytes
  • Array: 31 bytes
  • Ptr: 23 bytes
  • Rptr: 31 bytes
  • BareFn: 15 bytes
  • Never: 0 bytes
  • Tup: 23 bytes
  • Path: 31 bytes
  • OpaqueDef: 23 bytes
  • TraitObject: 31 bytes
  • Typeof: 23 bytes
  • Infer: 0 bytes
  • Err: 0 bytes