Add Self implsource
#372
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Add Self implsource
#372
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Re-introduce `try_normalize_erasing_regions`, but only when we compare two predicate for equality: Rust consider two instance to be overlapping if they differ only in terms of lifetime, thus while trait resolution, this information is useless. Worse, in some situation, two predicates can end up different solely because of lifetimes.
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Fixes #370
This PR:
Selfkind forImplSource. This is useful for generic information within a trait.implon function calls.Fixes #20
Note: this PR failing is blocking for @cmester0's #349 and #348.
Since this is a bit urgent, my plan is to make failure silent for now: any backend that relies on this feature will then possibly generate bad code if we hit the edge case that currently makes this PR fails.