bjoernager/rust
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Disallow associated type constraints on negative bounds

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This commit is contained in:
Michael Goulet 2023-04-25 05:47:05 +00:00
parent 6e01e910cb
commit 86f50b9f5c
6 changed files with 76 additions and 2 deletions
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12
compiler/rustc_ast_passes/src/ast_validation.rs
View file

@ -1177,6 +1177,18 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
}
}
// Negative trait bounds are not allowed to have associated constraints
if let GenericBound::Trait(trait_ref, TraitBoundModifier::Negative) = bound
&& 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.err_handler().emit_err(errors::ConstraintOnNegativeBound { span: constraint.span });
}
}
}
visit::walk_param_bound(self, bound)
}

7
compiler/rustc_ast_passes/src/errors.rs
View file

@ -701,3 +701,10 @@ pub struct NegativeBoundUnsupported {
#[primary_span]
pub span: Span,
}
#[derive(Diagnostic)]
#[diag(ast_passes_constraint_on_negative_bound)]
pub struct ConstraintOnNegativeBound {
#[primary_span]
pub span: Span,
}