check current point

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/src/lib.rs b/src/lib.rs
index 1a1620511a37eab148b1f24f287ebc1b0fa37495..f01a3fa72b4c77808bb483cc96bfd3595c3d2852 100644 (file)
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -27,6 +27,7 @@ pub fn read_vertices() -> impl Iterator<Item=Shape> {
       current[i] += d;
       current
     }).collect_vec();
+    assert_eq!(current, Point::default());
     shape_abut_zero(&mut points);
     points
   })