Struct rustc_mir_build::thir::pattern::usefulness::MatchCheckCtxt

pub(crate) struct MatchCheckCtxt<'a, 'tcx> {
    pub(crate) tcx: TyCtxt<'tcx>,
    pub(crate) module: DefId,
    pub(crate) param_env: ParamEnv<'tcx>,
    pub(crate) pattern_arena: &'a TypedArena<Pat<'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: &'a TypedArena<Pat<'tcx>>

Implementations

impl<'a, 'tcx> MatchCheckCtxt<'a, 'tcx>

pub(super) fn is_uninhabited(&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].