diff -r 000000000000 -r 959103a6100f test/tools/javac/T8024207/FlowCrashTest.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/tools/javac/T8024207/FlowCrashTest.java	Wed Apr 27 01:34:52 2016 +0800
@@ -0,0 +1,23 @@
+/*
+ * @test  /nodynamiccopyright/
+ * @bug 8024207
+ * @summary javac crash in Flow$AssignAnalyzer.visitIdent
+ * @compile/fail/ref=FlowCrashTest.out -XDrawDiagnostics FlowCrashTest.java
+ */
+
+import java.util.*;
+import java.util.stream.*;
+
+public class FlowCrashTest {
+    static class ViewId { }
+
+    public void crash() {
+
+        Map<ViewId,String> viewToProfile = null;
+        new TreeMap<>(viewToProfile.entrySet().stream()
+                      .collect(Collectors.toMap((vid, prn) -> prn,
+                                                (vid, prn) -> Arrays.asList(vid),
+                                                (a, b) -> { a.addAll(b); return a; })));
+
+    }
+}