[Issue 15983] New: [REG 2.071] Symbol visibility in derived classes

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15983

          Issue ID: 15983
           Summary: [REG 2.071] Symbol visibility in derived classes
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: regression
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: renezwanenburg at gmail.com

This is probably the same issue as 15897, only no circular imports are
involved:

---
module a;

class Base
{
  private alias Something = int;
}

void foo(T : Base)(T t)
{
  T.Something something;
}

---
module b;
import a;

class Derived : Base {}

void main()
{
  foo(new Derived());
}
---

This fails to compile with the message
a.d(10): Error: no property 'Something' for type 'b.Derived'.

In this case the fix is easy enough: just use Base.Something in foo(). But my
actual code involves a templated base class and template mixin which make that
unfeasible.

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