error: circular modules: $DIR/circular_modules_main.rs -> $DIR/circular_modules_hello.rs -> $DIR/circular_modules_main.rs --> $DIR/circular_modules_hello.rs:4:1 | LL | mod circular_modules_main; | ^^^^^^^^^^^^^^^^^^^^^^^^^^ error[E0425]: cannot find function `hi_str` in module `circular_modules_main` --> $DIR/circular_modules_hello.rs:7:43 | LL | println!("{}", circular_modules_main::hi_str()); | ^^^^^^ not found in `circular_modules_main` | help: consider importing this function | LL + use hi_str; | help: if you import `hi_str`, refer to it directly | LL - println!("{}", circular_modules_main::hi_str()); LL + println!("{}", hi_str()); | error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0425`.