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An unresolved name was used.
Erroneous code examples:
```
something_that_doesnt_exist::foo;
// error: unresolved name `something_that_doesnt_exist::foo`
// or:
trait Foo {
fn bar() {
Self; // error: unresolved name `Self`
}
}
// or:
let x = unknown_variable; // error: unresolved name `unknown_variable`
```
Please verify that the name wasn't misspelled and ensure that the
identifier being referred to is valid for the given situation. Example:
```
enum something_that_does_exist {
Foo,
}
```
Or:
```
mod something_that_does_exist {
pub static foo : i32 = 0i32;
}
something_that_does_exist::foo; // ok!
```
Or:
```
let unknown_variable = 12u32;
let x = unknown_variable; // ok!
```
If the item is not defined in the current module, it must be imported using a
`use` statement, like so:
```
use foo::bar;
bar();
```
If the item you are importing is not defined in some super-module of the
current module, then it must also be declared as public (e.g., `pub fn`).
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