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§

Blanket Implementations§

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.

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