[Patch/gfortran] Empty array constructors

[Erik Edelmann <eedelman at acclab dot helsinki dot fi>]

The following code 

        program hum
            print *, (//)
        end program hum

currently gives an ICE:

        hum.f90: In function 'MAIN__':
        hum.f90:3: internal compiler error: in gfc_typenode_for_spec, at fortran/trans-types.c:631

The code is invalid, as discussed in recent thread ("Zero-size array
literal") in comp.lang.fortran, but a meaningful error message would still
be better than an ICE. The attached patch fixes this.

Bubblestrapped and reg. tested on Linux-x86, on 4.0 and mainline.   Please
commit if OK.


Changelog entry for patch:

2005-06-04 Erik Edelmann <erik.edelmann@iki.fi>
        * array.c (gfc_match_array_constructor) Treat empty array
          constructors as an syntax error.



Changelog entry for test case (test case attached):

2005-06-04 Erik Edelmann <erik.edelmann@iki.fi>
        * gfortran.dg/array_constructor_3.f90: New test



        Erik

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