bors b0f8618938 Auto merge of #125413 - lcnr:ambig-drop-region-constraints, r=compiler-errors ...

drop region constraints for ambiguous goals

See the comment in `compute_external_query_constraints`. While the underlying issue is preexisting, this fixes a bug introduced by #125343.

It slightly weakens the leak chec, even if we didn't have any test which was affected. I want to write such a test before merging this PR.

r? `@compiler-errors`

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Auto merge of #125413 - lcnr:ambig-drop-region-constraints, r=compiler-errors

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