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Coherence negative impls implied bounds
Fixes #93875
This PR is rebased on top of #100789 and it would need to include that one which is already r+ed.
r? ``@nikomatsakis``
cc ``@lcnr`` (which I've talked about 3222f420d9
, I guess after you finish your reordering of modules and work with OutlivesEnvironmentEnv this commit can just be reverted).