diff -r b36f797e7177 java.source/test/unit/src/org/netbeans/api/java/source/gen/OperatorsTest.java
--- a/java.source/test/unit/src/org/netbeans/api/java/source/gen/OperatorsTest.java	Thu May 07 12:43:45 2009 +0200
+++ b/java.source/test/unit/src/org/netbeans/api/java/source/gen/OperatorsTest.java	Sun May 10 20:39:59 2009 +0100
@@ -41,6 +41,7 @@
 package org.netbeans.api.java.source.gen;
 
 import com.sun.source.tree.*;
+import com.sun.source.util.TreePath;
 import static com.sun.source.tree.Tree.*;
 import java.io.File;
 import org.netbeans.api.java.source.*;
@@ -286,6 +287,35 @@
                 return make.Unary(Kind.LOGICAL_COMPLEMENT, make.Parenthesized(input));
         }
     }
+
+    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);
+    }
             
     String getGoldenPckg() {
         return "";