bjoernager/rust
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remove redundent "<>" for ty::Slice with reference type

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this fix #103271
This commit is contained in:
Yiming Lei 2022-10-27 22:38:59 -07:00
parent 73c9eaf214
commit 0b6934d6c6
4 changed files with 74 additions and 0 deletions
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44
compiler/rustc_span/src/source_map.rs
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@ -753,6 +753,50 @@ impl SourceMap {
}
}
/// Given a 'Span', tries to tell if the next character is '>'
/// and the previous charactoer is '<' after skipping white space
/// return true if wrapped by '<>'
pub fn span_wrapped_by_angle_bracket(&self, span: Span) -> bool {
self.span_to_source(span, |src, start_index, end_index| {
if src.get(start_index..end_index).is_none() {
return Ok(false);
}
// test the right side to match '>' after skipping white space
let end_src = &src[end_index..];
let mut i = 0;
while let Some(cc) = end_src.chars().nth(i) {
if cc == ' ' {
i = i + 1;
} else if cc == '>' {
// found > in the right;
break;
} else {
// failed to find '>' return false immediately
return Ok(false);
}
}
// test the left side to match '<' after skipping white space
i = start_index;
let start_src = &src[0..start_index];
while let Some(cc) = start_src.chars().nth(i) {
if cc == ' ' {
if i == 0 {
return Ok(false);
}
i = i - 1;
} else if cc == '<' {
// found < in the left
break;
} else {
// failed to find '<' return false immediately
return Ok(false);
}
}
return Ok(true);
})
.map_or(false, |is_accessible| is_accessible)
}
/// Given a `Span`, tries to get a shorter span ending just after the first occurrence of `char`
/// `c`.
pub fn span_through_char(&self, sp: Span, c: char) -> Span {