New Java parser (incomplete parenthesized expression parsing fixed)

java/java-tests/testData/psi/parser-partial/expressions/Parenth2.txt

@@ -0,0 +1,5 @@
+PsiJavaFile:Parenth2.java
+  PsiParenthesizedExpression:(
+    PsiJavaToken:LPARENTH('(')
+    PsiErrorElement:Expression expected
+      <empty list>

java/java-tests/testSrc/com/intellij/lang/java/parser/partial/ExpressionParserTest.java

@@ -49,6 +49,7 @@ public class ExpressionParserTest extends JavaParsingTestCase {
 
   public void testParenth0() { doParserTest("(c)"); }
   public void testParenth1() { doParserTest("(this).f--"); }
+  public void testParenth2() { doParserTest("("); }
 
   public void testNewInExprList() { doParserTest("call(new)"); }