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99437b303a
Strict provenance lint diagnostics improvements Use `multipart_suggestion` instead of `span_suggestion` and getting a snippet for the expression. Also don't suggest unnecessary parenthesis in `lossy_provenance_casts`. cc ``@estebank`` ``@rustbot`` label A-diagnostics
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.