A clippy lint to warn on default match binding modes

[phaylon]

@H2CO3

The thing I find the most infuriating is that the lang team explicitly refuses to add a Clippy lint against using default binding modes “because we don’t lint away an RFCd feature”. Why can’t I have my types back?

There was actually some movement on that a while ago. See Linting and match ergonomics and Defensive programming clippy lint category. I tried to get the ball rolling a bit after those discussions, but IIRC on #clippy it was suggested to wait until after the 2018 edition was out. I just haven't had the energy yet to start pushing again on that front.