Auto merge of rust-lang#34907 - arielb1:found-parse-error, r=nikomats…

…akis

Centralize and clean type error reporting

Refactors the code that handles type errors to be cleaner and fixes various edge cases.

This made the already-bad "type mismatch resolving" error message somewhat uglier. I want to fix that in another commit before this PR is merged.

Fixes rust-lang#31173

r? @jonathandturner, cc @nikomatsakis

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