Struct rustc_mir_build::thir::pattern::usefulness::UsefulnessReport
source · [−]pub(crate) struct UsefulnessReport<'p, 'tcx> {
pub(crate) arm_usefulness: Vec<(MatchArm<'p, 'tcx>, Reachability)>,
pub(crate) non_exhaustiveness_witnesses: Vec<DeconstructedPat<'p, 'tcx>>,
}Expand description
The output of checking a match for exhaustiveness and arm reachability.
Fields
arm_usefulness: Vec<(MatchArm<'p, 'tcx>, Reachability)>For each arm of the input, whether that arm is reachable after the arms above it.
non_exhaustiveness_witnesses: Vec<DeconstructedPat<'p, 'tcx>>If the match is exhaustive, this is empty. If not, this contains witnesses for the lack of exhaustiveness.
Auto Trait Implementations
impl<'p, 'tcx> !RefUnwindSafe for UsefulnessReport<'p, 'tcx>
impl<'p, 'tcx> !Send for UsefulnessReport<'p, 'tcx>
impl<'p, 'tcx> !Sync for UsefulnessReport<'p, 'tcx>
impl<'p, 'tcx> Unpin for UsefulnessReport<'p, 'tcx>where
'tcx: 'p,
impl<'p, 'tcx> !UnwindSafe for UsefulnessReport<'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: 48 bytes