introduce variable: distinguish lambda parameters but allow param free expressions (IDEA-163785)

java/java-tests/testData/refactoring/introduceVariable/DistinguishLambdaParams.after.java

@@ -0,0 +1,15 @@
+import java.util.function.UnaryOperator;
+
+class Main {
+  public static void main(String[] args) {
+    UnaryOperator<String> f1 = s -> {
+      System.out.println("foo");
+        String temp = s.trim();
+        return temp;
+    };
+    UnaryOperator<String> f2 = s -> {
+      System.out.println("foo");
+      return s.trim();
+    };
+  }
+}

java/java-tests/testData/refactoring/introduceVariable/DistinguishLambdaParams.java

@@ -0,0 +1,14 @@
+import java.util.function.UnaryOperator;
+
+class Main {
+  public static void main(String[] args) {
+    UnaryOperator<String> f1 = s -> {
+      System.out.println("foo");
+      return <selection>s.trim()</selection>;
+    };
+    UnaryOperator<String> f2 = s -> {
+      System.out.println("foo");
+      return s.trim();
+    };
+  }
+}

java/java-tests/testSrc/com/intellij/refactoring/IntroduceVariableTest.java

@@ -211,6 +211,10 @@ public class IntroduceVariableTest extends LightCodeInsightTestCase {
     doTest(new MockIntroduceVariableHandler("temp", true, false, false, "int"));
   }
 
+  public void testDistinguishLambdaParams() {
+    doTest(new MockIntroduceVariableHandler("temp", true, false, false, CommonClassNames.JAVA_LANG_STRING));
+  }
+
   public void testDuplicateGenericExpressions() {
     doTest(new MockIntroduceVariableHandler("temp", true, false, false, "Foo2<? extends java.lang.Runnable>"));
   }