Pre-DR: incomplete function return types
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6.7.5.3#1 says

       [#1] A function declarator shall not specify a  return  type
       that is a function type or an array type.

6.9.1 (entitled "Function definitions") paragraph 3 says

       [#3] The return type of a  function  shall  be  void  or  an
       object type other than array type.

Does this constraint in 6.9.1#3 apply to all function declarations -
on the basis that it says "a function" and not "a function definition"
- or only to those that are definitions?  That is, do the following
declarations (supposing each to be the only declaration in the
translation unit) involve constraint violations?  (A conformance
testsuite considers that the first does, based on C90 DR#113, but that
DR only involves function definitions and not declarations which
aren't definitions.)

  volatile void f(void);

  struct s g(void);

I believe that if the first involves a constraint violation then so
must the second, although the second describes a function which could
be defined once struct s has been completed.