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An undeclared crate, module, or type was used.
Erroneous code example:
```compile_fail,E0433
let map = HashMap::new();
// error: failed to resolve: use of undeclared type `HashMap`
```
Please verify you didn't misspell the type/module's name or that you didn't
forget to import it:
```
use std::collections::HashMap; // HashMap has been imported.
let map: HashMap<u32, u32> = HashMap::new(); // So it can be used!
```
If you've expected to use a crate name:
```compile_fail
use ferris_wheel::BigO;
// error: failed to resolve: use of undeclared crate or module `ferris_wheel`
```
Make sure the crate has been added as a dependency in `Cargo.toml`.
To use a module from your current crate, add the `crate::` prefix to the path.
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