lambda: effectively final parameters: copy in final variable if needed - never make implicitly final

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/highlighting/EffectiveFinal.java

@@ -90,4 +90,28 @@ class Sample {
                 runnable.run();         // prints 111
                 runnable2.run();        // prints 444
         }
+}
+
+class ParameterIsEffectivelyFinal {
+  {
+    Comparable<String> c = o->{
+      new Runnable() {
+        @Override
+        public void run() {
+          System.out.println(o);
+        }
+      }.run();
+      return 0;
+    };
+    Comparable<String> c1 = o->{
+      o = "";
+      new Runnable() {
+        @Override
+        public void run() {
+          System.out.println(<error descr="Variable 'o' is accessed from within inner class. Needs to be declared final.">o</error>);
+        }
+      }.run();
+      return 0;
+    };
+  }
 }

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/anonymous2lambda/afterComparable.java

@@ -1,7 +1,7 @@
 // "Replace with lambda" "true"
 class Test {
   {
-    Comparable<String> c = (o)->{
+    Comparable<String> c = o->{
         return 0;
     }; 
   }

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/anonymous2lambda/afterComparableNeedToBeFinal.java

@@ -1,7 +1,7 @@
 // "Replace with lambda" "true"
 class Test {
   {
-    Comparable<String> c = (final String o)->{
+    Comparable<String> c = o->{
         Runnable r = new Runnable() {
             @Override
             public void run() {

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/mustBeFinal/afterCopyLambdaParam.java

@@ -0,0 +1,17 @@
+// "Copy 'o' to temp final variable" "true"
+class Test1 {
+    void foo(){}
+    {
+        Comparable<String> a = o->{
+            o = "";
+            final String finalO = o;
+            new Runnable() {
+                @Override
+                public void run() {
+                    System.out.println(finalO);
+                }
+            }.run();
+            return 0;
+        };
+    }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/mustBeFinal/beforeCopyLambdaParam.java

@@ -0,0 +1,16 @@
+// "Copy 'o' to temp final variable" "true"
+class Test1 {
+    void foo(){}
+    {
+        Comparable<String> a = o->{
+            o = "";
+            new Runnable() {
+                @Override
+                public void run() {
+                    System.out.println(<caret>o);
+                }
+            }.run();
+            return 0;
+        };
+    }
+}