error[E0583]: file not found for module `module_that_doesnt_exist` --> $DIR/E0583.rs:1:1 | LL | mod module_that_doesnt_exist; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = help: to create the module `module_that_doesnt_exist`, create file "$DIR/module_that_doesnt_exist.rs" or "$DIR/module_that_doesnt_exist/mod.rs" = note: if there is a `mod module_that_doesnt_exist` elsewhere in the crate already, import it with `use crate::...` instead error: aborting due to previous error For more information about this error, try `rustc --explain E0583`.