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Don't crash on empty match in the nonexhaustive_omitted_patterns lint #117034

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Oct 22, 2023
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Don't crash on empty match in the nonexhaustive_omitted_patterns lint #117034

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3 changes: 3 additions & 0 deletions compiler/rustc_mir_build/src/thir/pattern/usefulness.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -884,6 +884,9 @@ fn collect_nonexhaustive_missing_variants<'p, 'tcx>(
cx: &MatchCheckCtxt<'p, 'tcx>,
column: &[&DeconstructedPat<'p, 'tcx>],
) -> Vec<WitnessPat<'tcx>> {
if column.is_empty() {
return Vec::new();
}
let ty = column[0].ty();
Comment on lines +887 to 890
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this could have been get + let-else

    let Some(ty) = column.get(0) else { return Vec::new(); };
    let ty = ty.ty();

not that it matters though.

let pcx = &PatCtxt { cx, ty, span: DUMMY_SP, is_top_level: false };

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7 changes: 7 additions & 0 deletions tests/ui/rfcs/rfc-2008-non-exhaustive/omitted-patterns.rs
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Expand Up @@ -251,3 +251,10 @@ fn main() {
pub fn takes_non_exhaustive(_: NonExhaustiveEnum) {
let _closure = |_: NonExhaustiveEnum| {};
}

// ICE #117033
enum Void {}
#[deny(non_exhaustive_omitted_patterns)]
pub fn void(v: Void) -> ! {
match v {}
}
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