fixed bug in 'DataFlowInfo.getPossibleTypes'

parent types should be enriched as well

compiler/frontend/src/org/jetbrains/jet/lang/resolve/calls/autocasts/DelegatingDataFlowInfo.java

@@ -102,9 +102,10 @@ import static org.jetbrains.jet.lang.resolve.calls.autocasts.Nullability.NOT_NUL
     @Override
     @NotNull
     public Set<JetType> getPossibleTypes(@NotNull DataFlowValue key) {
-        Set<JetType> types = typeInfo.get(key);
+        Set<JetType> theseTypes = typeInfo.get(key);
+        Set<JetType> types = parent == null ? theseTypes : Sets.union(theseTypes, parent.getPossibleTypes(key));
         if (getNullability(key).canBeNull()) {
-            return parent == null ? types : Sets.union(types, parent.getPossibleTypes(key));
+            return types;
         }
 
         Set<JetType> enrichedTypes = Sets.newHashSetWithExpectedSize(types.size() + 1);
@@ -116,7 +117,7 @@ import static org.jetbrains.jet.lang.resolve.calls.autocasts.Nullability.NOT_NUL
             enrichedTypes.add(TypeUtils.makeNotNullable(type));
         }
 
-        return parent == null ? enrichedTypes : Sets.union(enrichedTypes, parent.getPossibleTypes(key));
+        return enrichedTypes;
     }
 
     @Override

compiler/testData/diagnostics/tests/nullabilityAndAutoCasts/dataFlowInfoAfterExclExcl.kt

@@ -0,0 +1,8 @@
+fun foo(d: Any?) {
+    if (d is String?) {
+        <!DEBUG_INFO_AUTOCAST!>d<!>!!
+        doString(<!DEBUG_INFO_AUTOCAST!>d<!>)
+    }
+}
+
+fun doString(s: String) = s

compiler/tests/org/jetbrains/jet/checkers/JetDiagnosticsTestGenerated.java

@@ -4577,6 +4577,11 @@ public class JetDiagnosticsTestGenerated extends AbstractDiagnosticsTestWithEage
                 doTest("compiler/testData/diagnostics/tests/nullabilityAndAutoCasts/AssertNotNull.kt");
             }
             
+            @TestMetadata("dataFlowInfoAfterExclExcl.kt")
+            public void testDataFlowInfoAfterExclExcl() throws Exception {
+                doTest("compiler/testData/diagnostics/tests/nullabilityAndAutoCasts/dataFlowInfoAfterExclExcl.kt");
+            }
+            
             @TestMetadata("equalityUnderNotNullCheck.kt")
             public void testEqualityUnderNotNullCheck() throws Exception {
                 doTest("compiler/testData/diagnostics/tests/nullabilityAndAutoCasts/equalityUnderNotNullCheck.kt");