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Rollup merge of #94756 - ChrisDenton:unreachable, r=yaahc

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Use `unreachable!` for an unreachable code path

Closes #73212
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Dylan DPC 2022-03-09 06:38:53 +01:00 • committed by GitHub
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8
library/std/src/sys/windows/mod.rs
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@ -224,8 +224,14 @@ where
} as usize;
if k == n && c::GetLastError() == c::ERROR_INSUFFICIENT_BUFFER {
n *= 2;
} else if k >= n {
} else if k > n {
n = k;
} else if k == n {
// It is impossible to reach this point.
// On success, k is the returned string length excluding the null.
// On failure, k is the required buffer length including the null.
// Therefore k never equals n.
unreachable!();
} else {
return Ok(f2(&buf[..k]));
}