bjoernager/rust
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Use more slice patterns inside the compiler

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This commit is contained in:
León Orell Valerian Liehr 2024-08-07 12:41:49 +02:00
parent 60d146580c
commit c4c518d2d4
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GPG key ID: D17A07215F68E713
40 changed files with 191 additions and 221 deletions
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20
compiler/rustc_resolve/src/late.rs
View file

@ -445,8 +445,8 @@ impl<'a> PathSource<'a> {
Some(ExprKind::Call(call_expr, _)) => match &call_expr.kind {
// the case of `::some_crate()`
ExprKind::Path(_, path)
if path.segments.len() == 2
&& path.segments[0].ident.name == kw::PathRoot =>
if let [segment, _] = path.segments.as_slice()
&& segment.ident.name == kw::PathRoot =>
{
"external crate"
}
@ -2395,15 +2395,14 @@ impl<'a: 'ast, 'b, 'ast, 'tcx> LateResolutionVisitor<'a, 'b, 'ast, 'tcx> {
}
fn future_proof_import(&mut self, use_tree: &UseTree) {
let segments = &use_tree.prefix.segments;
if !segments.is_empty() {
let ident = segments[0].ident;
if let [segment, rest @ ..] = use_tree.prefix.segments.as_slice() {
let ident = segment.ident;
if ident.is_path_segment_keyword() || ident.span.is_rust_2015() {
return;
}
let nss = match use_tree.kind {
UseTreeKind::Simple(..) if segments.len() == 1 => &[TypeNS, ValueNS][..],
UseTreeKind::Simple(..) if rest.is_empty() => &[TypeNS, ValueNS][..],
_ => &[TypeNS],
};
let report_error = |this: &Self, ns| {
@ -3999,16 +3998,15 @@ impl<'a: 'ast, 'b, 'ast, 'tcx> LateResolutionVisitor<'a, 'b, 'ast, 'tcx> {
if this.should_report_errs() {
if candidates.is_empty() {
if path.len() == 2 && prefix_path.len() == 1 {
if path.len() == 2
&& let [segment] = prefix_path
{
// Delay to check whether methond name is an associated function or not
// ```
// let foo = Foo {};
// foo::bar(); // possibly suggest to foo.bar();
//```
err.stash(
prefix_path[0].ident.span,
rustc_errors::StashKey::CallAssocMethod,
);
err.stash(segment.ident.span, rustc_errors::StashKey::CallAssocMethod);
} else {
// When there is no suggested imports, we can just emit the error
// and suggestions immediately. Note that we bypass the usually error

13
compiler/rustc_resolve/src/late/diagnostics.rs
View file

@ -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));
}
}
@ -2104,8 +2103,8 @@ 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.

10
compiler/rustc_resolve/src/macros.rs
View file

@ -108,8 +108,8 @@ pub(crate) fn sub_namespace_match(
// `format!("{}", path)`, because that tries to insert
// line-breaks and is slow.
fn fast_print_path(path: &ast::Path) -> Symbol {
if path.segments.len() == 1 {
path.segments[0].ident.name
if let [segment] = path.segments.as_slice() {
segment.ident.name
} else {
let mut path_str = String::with_capacity(64);
for (i, segment) in path.segments.iter().enumerate() {
@ -724,10 +724,10 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
// Possibly apply the macro helper hack
if deleg_impl.is_none()
&& kind == Some(MacroKind::Bang)
&& path.len() == 1
&& path[0].ident.span.ctxt().outer_expn_data().local_inner_macros
&& let [segment] = path.as_slice()
&& segment.ident.span.ctxt().outer_expn_data().local_inner_macros
{
let root = Ident::new(kw::DollarCrate, path[0].ident.span);
let root = Ident::new(kw::DollarCrate, segment.ident.span);
path.insert(0, Segment::from_ident(root));
}