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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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type have errors
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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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This is step 2 towards fixing #77548.
In the codegen and codegen-units test suites, the `//` comment markers
were kept in order not to affect any source locations. This is because
these tests cannot be automatically `--bless`ed.
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actual changes in behaviour
This makes `type_alias_impl_trait` not actually do anything anymore
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This ensures that various wf checks have already been done before we
typeck item bodies.
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If a symbol name can only be imported from one place for a type, and
as long as it was not glob-imported anywhere in the current crate, we
can trim its printed path and print only the name.
This has wide implications on error messages with types, for example,
shortening `std::vec::Vec` to just `Vec`, as long as there is no other
`Vec` importable anywhere.
This adds a new '-Z trim-diagnostic-paths=false' option to control this
feature.
On the good path, with no diagnosis printed, we should try to avoid
issuing this query, so we need to prevent trimmed_def_paths query on
several cases.
This change also relies on a previous commit that differentiates
between `Debug` and `Display` on various rustc types, where the latter
is trimmed and presented to the user and the former is not.
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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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