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Add safety annotations in iter::range

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This commit is contained in:
CAD97 2020-05-21 13:21:55 -04:00
parent c25b82f5bb
commit 27d1cd857e
1 changed files with 4 additions and 0 deletions
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4
src/libcore/iter/range.rs
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@ -427,6 +427,8 @@ unsafe impl Step for char {
res = Step::forward_checked(res, 0x800)?;
}
if res <= char::MAX as u32 {
// SAFETY: res is a valid unicode scalar
// (below 0x110000 and not in 0xD800..0xE000)
Some(unsafe { char::from_u32_unchecked(res) })
} else {
None
@ -440,6 +442,8 @@ unsafe impl Step for char {
if start >= 0xE000 && 0xE000 > res {
res = Step::backward_checked(res, 0x800)?;
}
// SAFETY: res is a valid unicode scalar
// (below 0x110000 and not in 0xD800..0xE000)
Some(unsafe { char::from_u32_unchecked(res) })
}