Fix ICE when handling void initialized manifest constants.

gcc/d/ChangeLog:

2019-01-26  Iain Buclaw  <ibuclaw@gdcproject.org>

	PR d/89042
	* decl.cc (DeclVisitor::visit(VarDeclaration)): Don't assert if
	handling a void initialized manifest constant.

gcc/testsuite/ChangeLog:

2019-01-26  Iain Buclaw  <ibuclaw@gdcproject.org>

	PR d/89042
	* gdc.dg/pr89042a.d: New test.
	* gdc.dg/pr89042b.d: New test.

From-SVN: r268304

gcc/d/ChangeLog

+2019-01-26  Iain Buclaw  <ibuclaw@gdcproject.org>
+
+	PR d/89042
+	* decl.cc (DeclVisitor::visit(VarDeclaration)): Don't assert if
+	handling a void initialized manifest constant.
+
 2019-01-21  Iain Buclaw  <ibuclaw@gdcproject.org>
 
 	* d-frontend.cc (Compiler::paintAsType): Update for new signature.

gcc/d/decl.cc

@@ -593,8 +593,11 @@ public:
 	if (d->isInstantiated ())
 	  return;
 
+	/* Cannot make an expression out of a void initializer.  */
+	if (!d->_init || d->_init->isVoidInitializer ())
+	  return;
+
 	tree decl = get_symbol_decl (d);
-	gcc_assert (d->_init && !d->_init->isVoidInitializer ());
 	Expression *ie = initializerToExpression (d->_init);
 
 	/* CONST_DECL was initially intended for enumerals and may be used for

gcc/testsuite/ChangeLog

+2019-01-26  Iain Buclaw  <ibuclaw@gdcproject.org>
+
+	PR d/89042
+	* gdc.dg/pr89042a.d: New test.
+	* gdc.dg/pr89042b.d: New test.
+
 2019-01-26  Harald Anlauf  <anlauf@gmx.de>
 
 	PR fortran/57553

gcc/testsuite/gdc.dg/pr89042a.d

+// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89042
+enum void[] a = void;

gcc/testsuite/gdc.dg/pr89042b.d

+// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89042
+enum void[2] a = void;