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Simpler code path for subtracting from FixedLenSlice

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This commit is contained in:
Nadrieril 2019-11-03 21:22:14 +00:00
parent e092a17052
commit 909ec37028
1 changed files with 9 additions and 1 deletions
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10
src/librustc_mir/hair/pattern/_match.rs
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@ -672,7 +672,15 @@ impl<'tcx> Constructor<'tcx> {
vec![self.clone()]
}
}
FixedLenSlice(_) | VarLenSlice(_) => {
FixedLenSlice(self_len) => {
let overlaps = |c: &Constructor<'_>| match c {
FixedLenSlice(other_len) => other_len == self_len,
VarLenSlice(other_len) => other_len <= self_len,
_ => false,
};
if other_ctors.iter().any(overlaps) { vec![] } else { vec![self.clone()] }
}
VarLenSlice(_) => {
let mut remaining_ctors = if let VarLenSlice(len) = self {
(*len..pcx.max_slice_length + 1).map(FixedLenSlice).collect()
} else {