import com.sun.source.util.TreePath;

    public void testUnary158150() throws Exception {

        String test = "public class Test { void m(int x) { int y = - |- x; } }";

        String golden = "public class Test { void m(int x) { int y = +x; } }";

        testFile = new File(getWorkDir(), "Test.java");

        final int index = test.indexOf("|");

        assertTrue(index != -1);

        TestUtilities.copyStringToFile(testFile, test.replace("|", ""));

        JavaSource src = getJavaSource(testFile);

        Task<WorkingCopy> task = new Task<WorkingCopy>() {

            public void run(WorkingCopy copy) throws Exception {

                if (copy.toPhase(Phase.RESOLVED).compareTo(Phase.RESOLVED) < 0) {

                    return;

                }

                TreePath node = copy.getTreeUtilities().pathFor(index);

                assertEquals(Kind.UNARY_MINUS, node.getLeaf().getKind());

                UnaryTree original = (UnaryTree) node.getLeaf();

                System.out.println("original: " + original);

                TreeMaker make = copy.getTreeMaker();

                UnaryTree modified = make.Unary(Kind.UNARY_PLUS, original.getExpression());

                System.out.println("modified: " + modified);

                copy.rewrite(original, modified);

            }

        };

        src.runModificationTask(task).commit();

        String res = TestUtilities.copyFileToString(testFile);

        assertEquals(golden, res);

    }