possible nested class/struct alias this bug

[Eberhard]

Hello,

I came across this unexpected error in the first example, so I 
tested similar scenarios, but couldn't make any sense of it.

Thanks, Eberhard.


class A {
    void foo() {}

    static class B {
       private A a;
       alias a this;
		
       void bar() {
          this.foo(); // works fine
          foo();      // Error: this for `foo` needs to be type 
`A` not type `A.B`
       }
    }
}

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

class A {
    void foo() {}
}

class B {
    void foo() {}
	
    static class C {
       private A a;
       alias a this;
		
       void bar() {
          this.foo(); // works fine
          foo();      // Error: this for `foo` needs to be type 
`B` not type `B.C`
       }
    }
}

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

class A {
    void foo() {}
}

class B {
    // no foo
	
    static class C {
       private A a;
       alias a this;
		
       void bar() {
          this.foo(); // works fine
          foo();      // works fine
       }
    }
}