KT-3750 When without else

#KT-3750 Fixed

GitOrigin-RevId: 3f0280142dd950caf69d5f487f679702abdcf794

plugins/kotlin/idea/tests/test/org/jetbrains/jet/checkers/JetPsiCheckerTestGenerated.java

@@ -268,6 +268,11 @@ public class JetPsiCheckerTestGenerated extends AbstractJetPsiCheckerTest {
             doTest("idea/testData/checker/When.kt");
         }
         
+        @TestMetadata("WhenInEnumInExtensionProperty.kt")
+        public void testWhenInEnumInExtensionProperty() throws Exception {
+            doTest("idea/testData/checker/WhenInEnumInExtensionProperty.kt");
+        }
+        
     }
     
     @TestMetadata("idea/testData/checker/regression")

plugins/kotlin/idea/tests/test/org/jetbrains/jet/plugin/codeInsight/OutOfBlockModificationTest.java

@@ -59,6 +59,10 @@ public class OutOfBlockModificationTest extends LightCodeInsightFixtureTestCase
         doTest();
     }
 
+    public void testInGlobalPropertyWithGetter() {
+        doTest();
+    }
+
     public void testInMethod() {
         doTest();
     }

plugins/kotlin/idea/tests/testData/checker/WhenInEnumInExtensionProperty.kt

@@ -0,0 +1,15 @@
+// KT-3750 When without else
+
+enum class A {
+    e1
+    e2
+}
+class B(val a: A)
+val B.foo: Int
+    get() {
+        // Check absence [NO_ELSE_IN_WHEN] error
+        return when (a) {
+            A.e1 -> 1
+            A.e2 -> 3
+        }
+    }

plugins/kotlin/idea/tests/testData/codeInsight/outOfBlock/InGlobalPropertyWithGetter.kt

@@ -0,0 +1,9 @@
+// FALSE
+class B(val a: A)
+val B.foo: Int
+    get() {
+        return <caret>when (a) {
+            A.e1 -> 1
+            A.e2 -> 4
+        }
+    }