The following code is a stripped-down version of something that
apparently compiles on some compilers and not on others.  The
error is in the re-definition of the default template argument.
This sort of thing is illegal with default function arguments
(even "benign" redefinition is not allowed: [dcl.fct.default]).
Should we not have the same rules for template default arguments?

  template<class T, class U = int> class A;
  ...
  template<class T, class U = int> class A {
    ... body of class A
  };

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