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Rollup merge of #128762 - fmease:use-more-slice-pats, r=compiler-errors

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Use more slice patterns inside the compiler

Nothing super noteworthy. Just replacing the common 'fragile' pattern of "length check followed by indexing or unwrap" with slice patterns for legibility and 'robustness'.

r? ghost
This commit is contained in:
Matthias Krüger 2024-08-11 07:51:51 +02:00 • committed by GitHub
commit 32e0fe129d
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40 changed files with 191 additions and 221 deletions
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13
compiler/rustc_resolve/src/late/diagnostics.rs
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@ -650,14 +650,14 @@ impl<'a: 'ast, 'ast, 'tcx> LateResolutionVisitor<'a, '_, 'ast, 'tcx> {
let typo_sugg = self
.lookup_typo_candidate(path, following_seg, source.namespace(), is_expected)
.to_opt_suggestion();
if path.len() == 1
if let [segment] = path
&& !matches!(source, PathSource::Delegation)
&& self.self_type_is_available()
{
if let Some(candidate) =
self.lookup_assoc_candidate(ident, ns, is_expected, source.is_call())
{
let self_is_available = self.self_value_is_available(path[0].ident.span);
let self_is_available = self.self_value_is_available(segment.ident.span);
// Account for `Foo { field }` when suggesting `self.field` so we result on
// `Foo { field: self.field }`.
let pre = match source {
@ -665,7 +665,7 @@ impl<'a: 'ast, 'ast, 'tcx> LateResolutionVisitor<'a, '_, 'ast, 'tcx> {
if expr
.fields
.iter()
.any(|f| f.ident == path[0].ident && f.is_shorthand) =>
.any(|f| f.ident == segment.ident && f.is_shorthand) =>
{
format!("{path_str}: ")
}
@ -1258,8 +1258,7 @@ impl<'a: 'ast, 'ast, 'tcx> LateResolutionVisitor<'a, '_, 'ast, 'tcx> {
)
})
.collect();
if targets.len() == 1 {
let target = targets[0];
if let [target] = targets.as_slice() {
return Some(TypoSuggestion::single_item_from_ident(target.0.ident, target.1));
}
}
@ -2105,8 +2104,8 @@ impl<'a: 'ast, 'ast, 'tcx> LateResolutionVisitor<'a, '_, 'ast, 'tcx> {
filter_fn: &impl Fn(Res) -> bool,
) -> TypoCandidate {
let mut names = Vec::new();
if path.len() == 1 {
let mut ctxt = path.last().unwrap().ident.span.ctxt();
if let [segment] = path {
let mut ctxt = segment.ident.span.ctxt();
// Search in lexical scope.
// Walk backwards up the ribs in scope and collect candidates.