New Java parser (incomplete parenthesized expression parsing fixed)

java/java-impl/src/com/intellij/lang/java/parser/ExpressionParser.java

@@ -27,6 +27,7 @@ import com.intellij.psi.tree.TokenSet;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+import static com.intellij.lang.PsiBuilderUtil.expect;
 import static com.intellij.lang.java.parser.JavaParserUtil.*;
 
 
@@ -502,7 +503,11 @@ public class ExpressionParser {
         error(builder, JavaErrorMessages.message("expected.expression"));
       }
 
-      JavaParserUtil.expectOrError(builder, JavaTokenType.RPARENTH, JavaErrorMessages.message("expected.rparen"));
+      if (!expect(builder, JavaTokenType.RPARENTH)) {
+        if (inner != null) {
+          error(builder, JavaErrorMessages.message("expected.rparen"));
+        }
+      }
 
       parenth.done(JavaElementType.PARENTH_EXPRESSION);
       return parenth;

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)"); }