error[E0117]: only traits defined in the current crate can be implemented for arbitrary types
  --> $DIR/impl-foreign[foreign]-for-foreign.rs:12:1
   |
LL | impl Remote1<u32> for f64 {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^ impl doesn't use types inside crate
   |
   = note: `f64` is not defined in the current create
   = note: `u32` is not defined in the current create
   = note: define and implement a trait or new type instead

error: aborting due to previous error

For more information about this error, try `rustc --explain E0117`.