| 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 module or unlinked crate |
| ``` |
| |
| 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. |
