use $crate; : unresolved import `$crate`

[TimNN]

From piston2d-gfx_graphics:

error[E0432]: unresolved import `$crate`
  --> src/back_end.rs:30:1
   |
30 | gfx_pipeline_base!( pipe_colored {
   | ^ no `$crate` in the root
   |
   = note: this error originates in a macro outside of the current crate

macro definition:

#[macro_export]
macro_rules! gfx_pipeline_base {
    ($module:ident {
        $( $field:ident: $ty:ty, )*
    }) => {
        pub mod $module {
            use $crate;
            #[allow(unused_imports)]
            use super::*;
            gfx_pipeline_inner!{ $(
                $field: $ty,
            )*}
        }
    }
}

cc @jseyfried, #37213

[jseyfried]

Fixed in #37361.