src/tools/rustfmt/tests/target/mod-1.rs

// Deeply indented modules.

mod foo {
    mod bar {
        mod baz {}
    }
}

mod foo {
    mod bar {
        mod baz {
            fn foo() {
                bar()
            }
        }
    }

    mod qux {}
}

mod boxed {
    pub use std::boxed::{Box, HEAP};
}

pub mod x {
    pub fn freopen(
        filename: *const c_char,
        mode: *const c_char,
        mode2: *const c_char,
        mode3: *const c_char,
        file: *mut FILE,
    ) -> *mut FILE {
    }
}

mod y {
    // sup boooooiiii
}