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feat: Show witnesses of non-exhaustiveness in `missing-match-arm` diagnostic Shamelessly copied from rustc. Thus reporting format is same. This extends public api `hir::diagnostics::MissingMatchArms` with `uncovered_patterns: String` field. It does not expose data for implementing a quick fix yet. ----- Worth to note: current implementation does not give a comprehensive list of missing patterns. Also mentioned in [paper](http://moscova.inria.fr/~maranget/papers/warn/warn.pdf): > One may think that algorithm I should make an additional effort to provide more > non-matching values, by systematically computing recursive calls on specialized > matrices when possible, and by returning a list of all pattern vectors returned by > recursive calls. We can first observe that it is not possible in general to supply the > users with all non-matching values, since the signature of integers is (potentially) > infinite. |
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