import foo::* sometimes fails to import foo::foo

The file below fails with `unresolved name: foo` (in the main fn). When moving the import and main out of the extra module, the problem goes away. It also does not happen if `fn foo` has a name different from its enclosing module.

```
mod foo {
    fn foo() {}
}
mod blah {
    import foo::*;
    fn main() { foo(); }
}
```
