When changing the parameters of a lambda expression the Type of the variable should not be printed if this was not the case in the original expression.

The tests in LambdaTest.java specify null if the type should not be printed, but if a type should be printed can not be retrieved from the LambdaExpressionTree.


Test:
    public void testAddSecondLambdaParamWithType() throws Exception {
        testFile = new File(getWorkDir(), "Test.java");
        TestUtilities.copyStringToFile(testFile, 
            "package hierbas.del.litoral;\n\n" +
            "public class Test {\n" +
            "    public static void taragui() {\n" +
            "        ChangeListener l = (e) -> {};\n" + 
            "    }\n" +
            "}\n"
            );
        String golden =
            "package hierbas.del.litoral;\n\n" +
            "public class Test {\n" +
            "    public static void taragui() {\n" +
            "        ChangeListener l = (e, f) -> {};\n" + 
            "    }\n" +
            "}\n";
        JavaSource src = getJavaSource(testFile);
        
        Task<WorkingCopy> task = new Task<WorkingCopy>() {

            public void run(final WorkingCopy workingCopy) throws IOException {
                workingCopy.toPhase(Phase.RESOLVED);
                final TreeMaker make = workingCopy.getTreeMaker();
                new TreeScanner<Void, Void>() {
                    @Override public Void visitLambdaExpression(LambdaExpressionTree node, Void p) {
                        VariableTree vt = node.getParameters().get(0);
                        workingCopy.rewrite(node, make.addLambdaParameter(node, make.Variable(vt.getModifiers(), "f", vt.getType(), vt.getInitializer())));
                        return super.visitLambdaExpression(node, p);
                    }
                }.scan(workingCopy.getCompilationUnit(), null);
            }

        };
        src.runModificationTask(task).commit();
        String res = TestUtilities.copyFileToString(testFile);
        System.err.println(res);
        assertEquals(golden, res);
    }