Try to suggest dereferences on trait selection failed#72456

Merged

bors merged 3 commits intorust-lang:masterfrom ldm0:dereftrait

Jun 21, 2020

+594-250

Commits on Jun 20, 2020

Decouple Autoderef with FnCtxt and move Autoderef to librustc_trait_selection.
ldm0
committed
Try to suggest dereferences when trait selection failed.
ldm0
committed
Prevent incorrect help message for dereference suggestion
ldm0
committed