Struct rustc_mir_build::thir::pattern::usefulness::UsefulnessReport[−][src]

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.

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The type returned in the event of a conversion error.

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Layout

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Size: 48 bytes