[Roadmap] No output after cargo check

[flip1995]

Currently when cargo clippy is run after cargo check, it does not produce
any output. This is especially problematic since rust-analyzer is on the rise
and it uses cargo check for checking code. A fix is already implemented, but
it still has to be pushed over the finish line. This also includes the
stabilization of the cargo clippy --fix command or the support of multi-span
suggestions in rustfix.

More on this issue in #4612

Steps to completion:

• ???

[flip1995]

Fixed with #6687

[flip1995]

The fix will hit stable with 1.52.