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1145: Fix #1099, plug self type type parameters in infer_path_expr r=flodiebold a=edwin0cheng As discussed in #1099, this PR try to "plug" a `self type` type parameters in `infer_path_expr`. All the cases in 1099 was fixed and tested. And luckily, this PR fixed bug #1030 again and make the test output correct. Co-authored-by: Edwin Cheng <edwin0cheng@gmail.com>