49048eab47
Mention traits and types involved in unstable trait upcasting Fixes #95972 by printing the traits being upcasted and the types being coerced that cause that upcasting... --- the poor span mentioned in the original issue has nothing to do with trait upcasting diagnostic here... > The original example I had that made me run into this issue had an even longer expression there (multiple chained iterator methods) which just got all highlighted as one big block saying "somewhere here trait coercion is used and it's not allowed". I don't think I can solve that issue in general without fixing the ObligationCauseCode and span that gets passed into Coerce. |
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For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.