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This makes it easier to read the trait definition for newcomers: Sorted from least “complex” to most “complex” followed by trivial “plumbing” and grouped by area. * Move `allow_infer` above all `*_infer` methods * It's the least complex method of those * Allows the `*_infer` to be placed right next to each other * Move `probe_ty_param_bounds` further down right next to `lower_assoc_ty` and `probe_adt` * It's more complex than the `infer` methods, it should come “later” * Now all required lowering functions are grouped together * Move the “plumbing” function `set_tainted_by_errors` further down below any actual lowering methods. * Provided method should come last
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.