232aaeba7c
This PR fixes an issues where rustc would ignore subsequent `#[diagnostic::on_unimplemented]` attributes. The [corresponding RFC](https://rust-lang.github.io/rfcs/3368-diagnostic-attribute-namespace.html) specifies that the first matching instance of each option is used. Invalid attributes are linted and otherwise ignored. |
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|---|---|---|
| .. | ||
| auxiliary | ||
| on_unimplemented | ||
| can_use_the_diagnostic_name_in_other_places.rs | ||
| existing_proc_macros.rs | ||
| feature-gate-diagnostic_namespace.rs | ||
| feature-gate-diagnostic_namespace.stderr | ||
| non_existing_attributes_accepted.rs | ||
| non_existing_attributes_accepted.stderr | ||
| requires_path.rs | ||
| requires_path.stderr | ||