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Use if let to reduce some excessive indentation.

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This commit is contained in:
Nicholas Nethercote 2023-10-26 16:49:03 +11:00
parent dcb72e705f
commit c88954e9c1
1 changed files with 45 additions and 53 deletions
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98
compiler/rustc_ast_passes/src/ast_validation.rs
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@ -1442,62 +1442,54 @@ fn deny_equality_constraints(
let mut err = errors::EqualityInWhere { span: predicate.span, assoc: None, assoc2: None };
// Given `<A as Foo>::Bar = RhsTy`, suggest `A: Foo<Bar = RhsTy>`.
if let TyKind::Path(Some(qself), full_path) = &predicate.lhs_ty.kind {
if let TyKind::Path(None, path) = &qself.ty.kind {
match &path.segments[..] {
[PathSegment { ident, args: None, .. }] => {
for param in &generics.params {
if param.ident == *ident {
let param = ident;
match &full_path.segments[qself.position..] {
[PathSegment { ident, args, .. }] => {
// Make a new `Path` from `foo::Bar` to `Foo<Bar = RhsTy>`.
let mut assoc_path = full_path.clone();
// Remove `Bar` from `Foo::Bar`.
assoc_path.segments.pop();
let len = assoc_path.segments.len() - 1;
let gen_args = args.as_deref().cloned();
// Build `<Bar = RhsTy>`.
let arg = AngleBracketedArg::Constraint(AssocConstraint {
id: rustc_ast::node_id::DUMMY_NODE_ID,
ident: *ident,
gen_args,
kind: AssocConstraintKind::Equality {
term: predicate.rhs_ty.clone().into(),
},
span: ident.span,
});
// Add `<Bar = RhsTy>` to `Foo`.
match &mut assoc_path.segments[len].args {
Some(args) => match args.deref_mut() {
GenericArgs::Parenthesized(_) => continue,
GenericArgs::AngleBracketed(args) => {
args.args.push(arg);
}
},
empty_args => {
*empty_args = Some(
AngleBracketedArgs {
span: ident.span,
args: thin_vec![arg],
}
.into(),
);
}
}
err.assoc = Some(errors::AssociatedSuggestion {
span: predicate.span,
ident: *ident,
param: *param,
path: pprust::path_to_string(&assoc_path),
})
}
_ => {}
};
if let TyKind::Path(Some(qself), full_path) = &predicate.lhs_ty.kind
&& let TyKind::Path(None, path) = &qself.ty.kind
&& let [PathSegment { ident, args: None, .. }] = &path.segments[..]
{
for param in &generics.params {
if param.ident == *ident
&& let [PathSegment { ident, args, .. }] = &full_path.segments[qself.position..]
{
// Make a new `Path` from `foo::Bar` to `Foo<Bar = RhsTy>`.
let mut assoc_path = full_path.clone();
// Remove `Bar` from `Foo::Bar`.
assoc_path.segments.pop();
let len = assoc_path.segments.len() - 1;
let gen_args = args.as_deref().cloned();
// Build `<Bar = RhsTy>`.
let arg = AngleBracketedArg::Constraint(AssocConstraint {
id: rustc_ast::node_id::DUMMY_NODE_ID,
ident: *ident,
gen_args,
kind: AssocConstraintKind::Equality {
term: predicate.rhs_ty.clone().into(),
},
span: ident.span,
});
// Add `<Bar = RhsTy>` to `Foo`.
match &mut assoc_path.segments[len].args {
Some(args) => match args.deref_mut() {
GenericArgs::Parenthesized(_) => continue,
GenericArgs::AngleBracketed(args) => {
args.args.push(arg);
}
},
empty_args => {
*empty_args = Some(
AngleBracketedArgs {
span: ident.span,
args: thin_vec![arg],
}
.into(),
);
}
}
_ => {}
err.assoc = Some(errors::AssociatedSuggestion {
span: predicate.span,
ident: *ident,
param: param.ident,
path: pprust::path_to_string(&assoc_path),
})
}
}
}