Non-modules allowed in module positions in use.

Consider the following piece of code, which compiles:

mod bar {
    pub fn foo() { }
}

use bar::foo::{self};

fn main() {
    foo();
}

The use declaration is allowed to use foo as a module when foo is actually a function. This should not be allowed.

Further, when foo does exist as a module, regardless of visibility, self incorrectly imports items with the same name in that module:

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

use bar::foo::{self};

fn main() {
    foo();
}

@petrochenkov

Fixed in #38313.

Auto merge of #38313 - jseyfried:self_imports, r=nrc

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