diff -r 22109b5daced sys/src/cmd/cc/com.c
--- a/sys/src/cmd/cc/com.c	Wed Feb 26 21:45:00 2020 -0800
+++ b/sys/src/cmd/cc/com.c	Wed Feb 26 23:16:23 2020 -0800
@@ -342,10 +342,12 @@
 		if(o | tcom(r->right))
 			goto bad;
 		if(r->right->type->etype == TIND && vconst(r->left) == 0) {
+			r->type = r->right->type;
 			r->left->type = r->right->type;
 			r->left->vconst = 0;
 		}
 		if(r->left->type->etype == TIND && vconst(r->right) == 0) {
+			r->type = r->left->type;
 			r->right->type = r->left->type;
 			r->right->vconst = 0;
 		}
diff -r 22109b5daced sys/src/cmd/cc/sub.c
--- a/sys/src/cmd/cc/sub.c	Wed Feb 26 21:45:00 2020 -0800
+++ b/sys/src/cmd/cc/sub.c	Wed Feb 26 23:16:23 2020 -0800
@@ -1032,6 +1032,13 @@
 
 	if(n == Z)
 		goto no;
+	while(n->op == OCAST){
+		if(n->type->etype != TIND)
+			break;
+		if(n->type->link->etype != TVOID)
+			break;
+		n = n->left;
+	}
 	if(n->op != OCONST)
 		goto no;
 	if(n->type == T)