[Issue 9154] Incorrectly generated assignment operator

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http://d.puremagic.com/issues/show_bug.cgi?id=9154



--- Comment #1 from Andrei Alexandrescu <and...@metalanguage.com> 2012-12-13 
19:57:18 PST ---
Consider:

    struct S {
      int x;
      void opAssign(ref S s) { }
    }

    struct T {
      S member;
     }

    void main() {
      T t1, t2;
      t1 = t2;
    }

This fails to compile with the error:

    Error: cannot modify struct t1 T with immutable members 

The error is caused by the "ref" in the definition of opAssign. Replacing "ref"
with "ref const" or "ref immutable" doesn't help, either.

The compiler should act mechanically here: the generated assignment for T
should simply perform a field-by-field assignment without nitpicking.

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