| error[E0116]: cannot define inherent `impl` for a type outside of the crate where the type is defined | |
| --> $DIR/trait-or-new-type-instead.rs:1:1 | |
| | | |
| LL | / impl<T> Option<T> { | |
| LL | | | |
| LL | | pub fn foo(&self) { } | |
| LL | | } | |
| | |_^ impl for type defined outside of crate. | |
| | | |
| = 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 E0116`. |