Struct rustc_middle::mir::UserTypeProjection

pub struct UserTypeProjection {
    pub base: UserTypeAnnotationIndex,
    pub projs: Vec<ProjectionKind>,
}

Encodes the effect of a user-supplied type annotation on the subcomponents of a pattern. The effect is determined by applying the given list of proejctions to some underlying base type. Often, the projection element list projs is empty, in which case this directly encodes a type in base. But in the case of complex patterns with subpatterns and bindings, we want to apply only a part of the type to a variable, in which case the projs vector is used.

Examples:

• let x: T = ... -- here, the projs vector is empty.

• let (x, _): T = ... -- here, the projs vector would contain field[0] (aka .0), indicating that the type of s is determined by finding the type of the .0 field from T.

Fields

base: UserTypeAnnotationIndex

projs: Vec<ProjectionKind>

Implementations

impl UserTypeProjection

pub(crate) fn index(self) -> Self

pub(crate) fn subslice(self, from: u64, to: u64) -> Self

pub(crate) fn deref(self) -> Self

pub(crate) fn leaf(self, field: Field) -> Self

pub(crate) fn variant(
    self,
    adt_def: &AdtDef,
    variant_index: VariantIdx,
    field: Field
) -> Self

Trait Implementations

impl Clone for UserTypeProjection

fn clone(&self) -> UserTypeProjection

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for UserTypeProjection

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'tcx, __D: TyDecoder<'tcx>> Decodable<__D> for UserTypeProjection

fn decode(__decoder: &mut __D) -> Result<Self, <__D as Decoder>::Error>

impl<'tcx, __E: TyEncoder<'tcx>> Encodable<__E> for UserTypeProjection

fn encode(&self, __encoder: &mut __E) -> Result<(), <__E as Encoder>::Error>

impl<'__ctx> HashStable<StableHashingContext<'__ctx>> for UserTypeProjection

fn hash_stable(
    &self,
    __hcx: &mut StableHashingContext<'__ctx>,
    __hasher: &mut StableHasher
)

impl PartialEq<UserTypeProjection> for UserTypeProjection

fn eq(&self, other: &UserTypeProjection) -> bool

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

fn ne(&self, other: &UserTypeProjection) -> bool

This method tests for !=.

impl StructuralPartialEq for UserTypeProjection

impl<'tcx> TypeFoldable<'tcx> for UserTypeProjection

fn super_fold_with<F: TypeFolder<'tcx>>(&self, folder: &mut F) -> Self

fn super_visit_with<Vs: TypeVisitor<'tcx>>(
    &self,
    visitor: &mut Vs
) -> ControlFlow<()>

fn fold_with<F: TypeFolder<'tcx>>(&self, folder: &mut F) -> Self

fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()>

fn has_vars_bound_at_or_above(&self, binder: DebruijnIndex) -> bool

Returns true if self has any late-bound regions that are either bound by binder or bound by some binder outside of binder. If binder is ty::INNERMOST, this indicates whether there are any late-bound regions that appear free.

fn has_vars_bound_above(&self, binder: DebruijnIndex) -> bool

Returns true if this self has any regions that escape binder (and hence are not bound by it).

fn has_escaping_bound_vars(&self) -> bool

fn has_type_flags(&self, flags: TypeFlags) -> bool

fn has_projections(&self) -> bool

fn has_opaque_types(&self) -> bool

fn references_error(&self) -> bool

fn has_param_types_or_consts(&self) -> bool

fn has_infer_regions(&self) -> bool

fn has_infer_types(&self) -> bool

fn has_infer_types_or_consts(&self) -> bool

fn needs_infer(&self) -> bool

fn has_placeholders(&self) -> bool

fn needs_subst(&self) -> bool

fn has_free_regions(&self) -> bool

"Free" regions in this context means that it has any region that is not (a) erased or (b) late-bound.

fn has_erased_regions(&self) -> bool

fn has_erasable_regions(&self) -> bool

True if there are any un-erased free regions.

fn is_global(&self) -> bool

Indicates whether this value references only 'global' generic parameters that are the same regardless of what fn we are in. This is used for caching.

fn has_late_bound_regions(&self) -> bool

True if there are any late-bound regions

fn still_further_specializable(&self) -> bool

Indicates whether this value still has parameters/placeholders/inference variables which could be replaced later, in a way that would change the results of impl specialization.

fn visit_tys_shallow(
    &self,
    visit: impl FnMut(Ty<'tcx>) -> ControlFlow<()>
) -> ControlFlow<()>

A visitor that does not recurse into types, works like fn walk_shallow in Ty.