Turn on -enable-experimental-associated-type-inference by default #70375
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slavapestov
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This problem was introduced in 2017 by commit bbaa7f7. If a protocol requirement has multiple potential witnesses, and one of those witnesses only introduces tautological type witness bindings, we would be forced to choose among the remaining witnesses. However, this did not account for the possibility that the tautological witness is the correct choice; it's possible that we will infer the same type witnesses via a different protocol requirement.
Don't explore parts of the solution space that would lead to a worse solution than what we already have.
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This was referenced Feb 2, 2024
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Fixes #47262, fixes #51230, fixes #51199.