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78768361a0
It's an old (2017 or earlier) type that describes a `self` receiver. It's only used in `rustc_hir_analysis` for two error messages, and much of the complexity isn't used. I suspect it used to be used for more things. This commit removes it, and moves a greatly simplified version of the `determine` method into `rustc_hir_analysis`, renamed as `get_self_string`. The big comment on the method is removed because it no longer seems relevant.
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.