Weird error message for missing symbol if module name is the same as a macro

mod format {
    mod sub {
        pub fn foobar() { }
    }
}

fn main() {
    format::foobar();
}

$ rustc a.rs
error[E0423]: expected function, found macro `format::foobar`
 --> a.rs:8:5
  |
8 |     format::foobar();
  |     ^^^^^^^^^^^^^^ did you mean `format::foobar!(...)`?
  |
  = help: possible better candidate is found in another module, you can import it into scope:
            `use format::sub::foobar;`

error: aborting due to previous error

$ rustc --version
rustc 1.17.0-nightly (134c4a0f0 2017-03-20)

The weird thing is "expected function, found macro". format::foobar doesn't look like a macro. This also happens without the submodule sub (i.e. with an empty module format), the only difference is that no other candidate is suggested.

1. I got a similar error with this code:

   mod file {
   }
   
   fn main() {
       file::create();
   }
   

   The error is:

   error[E0423]: expected function, found macro `file::create`
    --> src/main.rs:5:5
     |
   5 |     file::create();
     |     ^^^^^^^^^^^^ did you mean `file::create!(...)`?
   

   antoyo at 2018-01-17 16:13:27