Matthias Krüger ecdb7bcee8
Rollup merge of #108136 - eggyal:unmet_trait_alias_bound_on_generic_impl, r=compiler-errors
Do not ICE on unmet trait alias impl bounds

Fixes #108132

I've also added some documentation to the `impl_def_id` field of `DerivedObligationCause` to try and minimise the risk of such errors in future.

r? `@compiler-errors`
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