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The code refers to a trait that is not in scope.
Erroneous code example:
```compile_fail,E0405
struct Foo;
impl SomeTrait for Foo {} // error: trait `SomeTrait` is not in scope
```
Please verify that the name of the trait wasn't misspelled and ensure that it
was imported. Example:
```
# #[cfg(for_demonstration_only)]
// solution 1:
use some_file::SomeTrait;
// solution 2:
trait SomeTrait {
// some functions
}
struct Foo;
impl SomeTrait for Foo { // ok!
// implements functions
}
```
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