It has a clumsy type, with repeated `&'a [LintId]`, and sometimes requires an empty string that isn't used in the `Err`+`None` case. This commit splits it into two variants.
It has a clumsy type, with repeated `&'a [LintId]`, and sometimes requires an empty string that isn't used in the `Err`+`None` case. This commit splits it into two variants.