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>
impl<'p, 'tcx> !UnwindSafe for UsefulnessReport<'p, 'tcx>
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
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