73256c68b8
Silence some follow-up errors [3/x] this is one piece of the requested cleanups from https://github.com/rust-lang/rust/pull/117449 Keep error types around, even in obligations. These help silence follow-up errors, as we now figure out that some types (most notably inference variables) are equal to an error type. But it also allows figuring out more types in the presence of errors, possibly causing more errors.