bjoernager/rust
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Deny parenthetical notation for negative bounds

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This commit is contained in:
León Orell Valerian Liehr 2023-12-27 17:57:19 +01:00
parent 5f56465621
commit a251974015
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GPG key ID: D17A07215F68E713
5 changed files with 37 additions and 6 deletions
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21
compiler/rustc_ast_passes/src/ast_validation.rs
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@ -1257,13 +1257,24 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
if let GenericBound::Trait(trait_ref, modifiers) = bound
&& let BoundPolarity::Negative(_) = modifiers.polarity
&& let Some(segment) = trait_ref.trait_ref.path.segments.last()
&& let Some(ast::GenericArgs::AngleBracketed(args)) = segment.args.as_deref()
{
for arg in &args.args {
if let ast::AngleBracketedArg::Constraint(constraint) = arg {
self.dcx()
.emit_err(errors::ConstraintOnNegativeBound { span: constraint.span });
match segment.args.as_deref() {
Some(ast::GenericArgs::AngleBracketed(args)) => {
for arg in &args.args {
if let ast::AngleBracketedArg::Constraint(constraint) = arg {
self.dcx().emit_err(errors::ConstraintOnNegativeBound {
span: constraint.span,
});
}
}
}
// The lowered form of parenthesized generic args contains a type binding.
Some(ast::GenericArgs::Parenthesized(args)) => {
self.dcx().emit_err(errors::NegativeBoundWithParentheticalNotation {
span: args.span,
});
}
None => {}
}
}