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c8ede152a5
Move param count error emission to end of `check_argument_types` The error emission here isn't exactly what is done in #92364, but replicating that is hard . The general move should make for a smaller diff. Also included the `(usize, Ty, Ty)` to -> `Option<(Ty, Ty)>` commit. r? ``@estebank``
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.