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Top level anonymous unions may not have their type set.

--- a/parse/infer.c

+++ b/parse/infer.c

@@ -514,7 +514,8 @@

 	case Tyunion:

 		inaggr++;

 		for (i = 0; i < t->nmemb; i++) {

-			assert(t->udecls[i]->utype);

+			if (!t->udecls[i]->utype)

+				t->udecls[i]->utype = t;

 			t->udecls[i]->utype = tf(t->udecls[i]->utype);

 			if (t->udecls[i]->etype) {

 				tyresolve(t->udecls[i]->etype);