C++ PATCH to avoid crash

[Mark Mitchell]

Here's a patch to avoid a crash on eb131.C.

-- 
Mark Mitchell 			mark@markmitchell.com
Mark Mitchell Consulting	http://www.markmitchell.com

1998-12-10  Mark Mitchell  <mark@markmitchell.com>

	* class.c (instantiate_type): Return error_mark_node rather than
	junk. 

Index: testsuite/g++.old-deja/g++.robertl/eb131.C
===================================================================
RCS file: /egcs/carton/cvsfiles/egcs/gcc/testsuite/g++.old-deja/g++.robertl/eb131.C,v
retrieving revision 1.6
diff -c -p -r1.6 eb131.C
*** eb131.C	1998/10/19 20:13:15	1.6
--- eb131.C	1998/12/10 21:33:00
*************** struct a {
*** 10,16 ****
  	void bar( double );
  	void bar( float );
  
! 	void foo( void (a::*member)(float) );
  };
  
  a::a()
--- 10,16 ----
  	void bar( double );
  	void bar( float );
  
!   void foo( void (a::*member)(float) ); // ERROR - candidate
  };
  
  a::a()
Index: cp/class.c
===================================================================
RCS file: /egcs/carton/cvsfiles/egcs/gcc/cp/class.c,v
retrieving revision 1.118
diff -c -p -r1.118 class.c
*** class.c	1998/12/09 16:20:01	1.118
--- class.c	1998/12/10 21:33:04
*************** instantiate_type (lhstype, rhs, complain
*** 5304,5309 ****
--- 5304,5310 ----
  			  function);
  		cp_error ("  to form a pointer to member function, say `&%T::%D'",
  			  t, DECL_NAME (function));
+ 		return error_mark_node;
  	      }
  
  	    mark_used (function);