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This reverts commit 6499c5e7fc173a3f55b7a3bd1e6a50e9edef782d, reversing
changes made to 78450d2d602b06d9b94349aaf8cece1a4acaf3a8.
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This reverts commit e7cc3bddbe0d0e374d05e7003e662bba1742dbae, reversing
changes made to 734368a200904ef9c21db86c595dc04263c87be0.
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by using an opaque type obligation to bubble up comparisons between opaque types and other types
Also uses proper obligation causes so that the body id works, because out of some reason nll uses body ids for logic instead of just diagnostics.
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actual changes in behaviour
This makes `type_alias_impl_trait` not actually do anything anymore
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compare mode chalk don't finish.
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This commit merges the logic used for opaque type type inference for
impl Trait and non-impl Trait cases. This fixes an ICE where
existential types used in the return types of functions would be allowed
to have an out-of-scope generic type parameter.
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