Auto merge of #32989 - GuillaumeGomez:e0393, r=Manishearth
Auto merge of #32989 - GuillaumeGomez:e0393, r=Manishearth

Add E0393 error explanation

Part of #32777.

r? @Manishearth
cc @steveklabnik

aidancully/rust,graydon/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,graydon/rust,GBGamer/rust,graydon/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,graydon/rust