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844a41903e
Do not emit solver errors that contain error types
any follow-up errors are going to either be duplicates or often disappear if the error itself is fixed.
in this PR it mostly silences dyn-compat errors as all the other errors are already deduplicated outside of the test suite. The dyn compat errors are independent errors and I think if the dyn compatiblity depended on an error type it would not actually show, so this is PR is actually silencing independent errors, too.
I am opening this PR because I am seeing lots of `{type error}: const Trait` errors when adding more const checking. So instead of targetting just those specific errors, I wanted to try out fully avoiding such errors near the trait solver.
cc ````@rust-lang/types```` for thoughts