bjoernager/rust
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review comment: reduce duplication

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This commit is contained in:
Esteban Kuber 2021-08-18 11:14:33 +00:00
parent 14add46e94
commit 12a776b41d
1 changed files with 27 additions and 24 deletions
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51
compiler/rustc_resolve/src/late/diagnostics.rs
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@ -2073,43 +2073,46 @@ impl<'tcx> LifetimeContext<'_, 'tcx> {
continue;
}
});
let span_unnamed_borrow = |span: Span| {
let lo = span.lo() + BytePos(1);
span.with_lo(lo).with_hi(lo)
};
let span_underscore_borrow = |span: Span| {
let lo = span.lo() + BytePos(1);
let hi = lo + BytePos(2);
span.with_lo(lo).with_hi(hi)
};
let unnamed_borrow =
|snippet: &str| snippet.starts_with('&') && !snippet.starts_with("&'");
for param in params {
if let Ok(snippet) = self.tcx.sess.source_map().span_to_snippet(param.span) {
if snippet.starts_with('&') && !snippet.starts_with("&'") {
let lo = param.span.lo() + BytePos(1);
let span = param.span.with_lo(lo).with_hi(lo);
if unnamed_borrow(&snippet) {
let span = span_unnamed_borrow(param.span);
introduce_suggestion.push((span, "'a ".to_string()));
} else if let Some(_) = snippet.strip_prefix("&'_ ") {
let lo = param.span.lo() + BytePos(1);
let hi = lo + BytePos(2);
let span = param.span.with_lo(lo).with_hi(hi);
} else if snippet.starts_with("&'_ ") {
let span = span_underscore_borrow(param.span);
introduce_suggestion.push((span, "'a".to_string()));
}
}
}
for ((span, _), sugg) in spans_with_counts.iter().copied().zip(suggs.iter()) {
match (sugg, self.tcx.sess.source_map().span_to_snippet(span)) {
(Some(sugg), Ok(snippet))
if snippet.starts_with('&')
&& !snippet.starts_with("&'")
&& sugg.starts_with("&") =>
{
let lo = span.lo() + BytePos(1);
let span = span.with_lo(lo).with_hi(lo);
for (span, sugg) in spans_with_counts.iter().copied().zip(suggs.iter()).filter_map(
|((span, _), sugg)| match sugg {
Some(sugg) => Some((span, sugg)),
_ => None,
},
) {
match self.tcx.sess.source_map().span_to_snippet(span) {
Ok(snippet) if unnamed_borrow(&snippet) && sugg.starts_with("&") => {
let span = span_unnamed_borrow(span);
introduce_suggestion.push((span, sugg[1..].to_string()));
}
(Some(sugg), Ok(snippet))
if snippet.starts_with("&'_ ") && sugg.starts_with("&") =>
{
let lo = span.lo() + BytePos(1);
let hi = lo + BytePos(2);
let span = span.with_lo(lo).with_hi(hi);
Ok(snippet) if snippet.starts_with("&'_ ") && sugg.starts_with("&") => {
let span = span_underscore_borrow(span);
introduce_suggestion.push((span, sugg[1..].to_string()));
}
(Some(sugg), _) => {
_ => {
introduce_suggestion.push((span, sugg.to_string()));
}
_ => {}
}
}
err.multipart_suggestion_with_style(