1 error[E0405]: cannot find trait `T` in this scope
2 --> $DIR/issue-21221-2.rs:18:6
4 LL | impl T for Foo { }
5 | ^ not found in this scope
7 help: consider importing one of these items
14 error: aborting due to previous error
16 For more information about this error, try `rustc --explain E0405`.