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Auto merge of #113690 - aliemjay:opaque-defined-by-trait, r=compiler-errors
allow opaques to be defined by trait queries, again
This basically reverts #112963.
Moreover, all call-sites of `enter_canonical_trait_query` can now define opaque types, see the ui test `defined-by-user-annotation.rs`.
Fixes #113689
r? `@compiler-errors` `@oli-obk`