hidden: do not occult pieces which aren't can_occultable

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

diff --git a/src/hidden.rs b/src/hidden.rs
index 037c358022b4542c7748872a2aacfea5e19ce974..9856354749a15062472e1600b4843adb215c512e 100644 (file)
--- a/src/hidden.rs
+++ b/src/hidden.rs
@@ -583,6 +583,10 @@ fn recalculate_occultation_general<
             // prevent occulting pieces being occulted
             // (also prevents reflexive occultation)
             return None
+          } else if ipc.occultable().is_none() {
+            // if we cannot make it look identical to the others, we
+            // cannot occult it beause we can't hide its identity
+            return None
           } else if occ.in_region(gpc.pos) {
             Some(Occulted { occid, occ })
           } else {