Struct rustc_mir_build::thir::pattern::usefulness::MatchCheckCtxt
source · pub(crate) struct MatchCheckCtxt<'p, 'tcx> {
pub(crate) tcx: TyCtxt<'tcx>,
pub(crate) module: DefId,
pub(crate) param_env: ParamEnv<'tcx>,
pub(crate) pattern_arena: &'p TypedArena<DeconstructedPat<'p, 'tcx>>,
}
Fields
tcx: TyCtxt<'tcx>
module: DefId
The module in which the match occurs. This is necessary for
checking inhabited-ness of types because whether a type is (visibly)
inhabited can depend on whether it was defined in the current module or
not. E.g., struct Foo { _private: ! }
cannot be seen to be empty
outside its module and should not be matchable with an empty match statement.
param_env: ParamEnv<'tcx>
pattern_arena: &'p TypedArena<DeconstructedPat<'p, 'tcx>>
Implementations
sourceimpl<'a, 'tcx> MatchCheckCtxt<'a, 'tcx>
impl<'a, 'tcx> MatchCheckCtxt<'a, 'tcx>
pub(super) fn is_uninhabited(&self, ty: Ty<'tcx>) -> bool
sourcepub(super) fn is_foreign_non_exhaustive_enum(&self, ty: Ty<'tcx>) -> bool
pub(super) fn is_foreign_non_exhaustive_enum(&self, ty: Ty<'tcx>) -> bool
Returns whether the given type is an enum from another crate declared #[non_exhaustive]
.
Auto Trait Implementations
impl<'p, 'tcx> !RefUnwindSafe for MatchCheckCtxt<'p, 'tcx>
impl<'p, 'tcx> !Send for MatchCheckCtxt<'p, 'tcx>
impl<'p, 'tcx> !Sync for MatchCheckCtxt<'p, 'tcx>
impl<'p, 'tcx> Unpin for MatchCheckCtxt<'p, 'tcx>where
'tcx: 'p,
impl<'p, 'tcx> !UnwindSafe for MatchCheckCtxt<'p, 'tcx>
Blanket Implementations
sourceimpl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
impl<'a, T> Captures<'a> for Twhere
T: ?Sized,
Layout
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