error[E0573]: expected type, found module `a` --> $DIR/impl-for-module.rs:7:12 | LL | trait A { | ------- similarly named trait `A` defined here ... LL | impl A for a { | ^ help: a trait with a similar name exists: `A` error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0573`.