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