Same namespace symbols don't merge together

[veremenko-y]

Version: wiz version 0.1.2 (alpha)
Code to reproduce:

file1.wiz

import "file2";
namespace lib {
in prg {
    func foo() {
        zoo(); // fail
        lib.zoo(); // success
    }
}
}

file2.wiz

import "file1";

namespace lib {
in prg {
    func bar() {
        foo();
    }

    func zoo()  {
        
    }
}
}

Ran with wiz.exe src/file2.wiz -o out.bin

Output:

file1.wiz:6: error: could not resolve identifier `zoo`
* wiz: failed with 1 error(s).