error: expected identifier
  --> tests/fail/double_options_attr.rs:14:5
   |
14 |     #[no_default]
   |     ^

warning: unused imports: `Circle`, `Cube`, and `Rectangle`
 --> tests/fail/double_options_attr.rs:5:23
  |
5 | use library::shapes::{Circle, Cube, Rectangle};
  |                       ^^^^^^  ^^^^  ^^^^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default