From e8254cec7d7bbee80f762f2cf640338e94530e63 Mon Sep 17 00:00:00 2001
From: Revar Desmera <revarbat@gmail.com>
Date: Thu, 8 Aug 2019 21:10:41 -0700
Subject: [PATCH] Fix for issue #82

---
 geometry.scad | 1 +
 1 file changed, 1 insertion(+)

diff --git a/geometry.scad b/geometry.scad
index 4ce463b..2d4ebf8 100644
--- a/geometry.scad
+++ b/geometry.scad
@@ -1012,6 +1012,7 @@ function offset(
 	flip_faces=false
 ) =
 	is_region(path)? (
+		assert(!return_faces, "return_faces not supported for regions.")
 		let(
 			path = [for (p=path) polygon_clockwise(p)? p : reverse(p)],
 			rgn = exclusive_or([for (p = path) [p]]),