[Issue 24109] New: [REG2.103] 'need this' when invoking outer method from inner method

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24109

          Issue ID: 24109
           Summary: [REG2.103] 'need this' when invoking outer method from
                    inner method
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: regression
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: kinke at gmx.net

This doesn't compile anymore since D v2.103 (and still doesn't with v2.105.0):
```
struct Outer {
    void method1() {}

    void method2() {
        class Inner {
            void innerMethod() {
                method1();
            }
        }
    }
}
```

```
Error: need `this` for `method1` of type `void()`
```

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