diff -r 5cc611ec85b3 -r 0782a966d781 hotspot/src/share/vm/gc/g1/heapRegionSet.cpp
--- a/hotspot/src/share/vm/gc/g1/heapRegionSet.cpp	Mon Nov 02 19:38:49 2015 +0000
+++ b/hotspot/src/share/vm/gc/g1/heapRegionSet.cpp	Mon Nov 02 10:41:39 2015 +0100
@@ -230,7 +230,7 @@
       assert(_tail != curr, "%s", hrs_ext_msg(this, "invariant").buffer());
       next->set_prev(prev);
     }
-    if (_last = curr) {
+    if (_last == curr) {
       _last = NULL;
     }