error[E0659]: `my_attr` is ambiguous (derive helper attribute vs any other name)
  --> $DIR/derive-helper-shadowing.rs:6:3
   |
LL | #[my_attr] //~ ERROR `my_attr` is ambiguous
   |   ^^^^^^^ ambiguous name
   |
note: `my_attr` could refer to the derive helper attribute defined here
  --> $DIR/derive-helper-shadowing.rs:7:10
   |
LL | #[derive(MyTrait)]
   |          ^^^^^^^
note: `my_attr` could also refer to the attribute macro imported here
  --> $DIR/derive-helper-shadowing.rs:4:5
   |
LL | use derive_helper_shadowing::*;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
   = help: use `crate::my_attr` to refer to this attribute macro unambiguously

error: aborting due to previous error

For more information about this error, try `rustc --explain E0659`.