Java: Detect trivial duplicates containing conditional 'return' (IDEA-182195)

java/java-tests/testData/refactoring/extractMethod/OutputVariableDuplicate_after.java

@@ -0,0 +1,26 @@
+import org.jetbrains.annotations.Nullable;
+
+public class OutputVariableDuplicate {
+    String foo() {
+        String var = newMethod();
+        if (var == null) return null;
+        System.out.println(var);
+        return var;
+    }
+
+    @Nullable
+    private String newMethod() {
+        String var = "";
+        if (var == null) {
+            return null;
+        }
+        return var;
+    }
+
+    String bar() {
+        String var = newMethod();
+        if (var == null) return null;
+        System.out.println(var);
+        return var;
+    }
+}