Fix Expression to work with Statement's automatic semicolon insertion logic.

js/narcissus/jsparse.js

@@ -951,6 +951,19 @@ loop:
             --x.parenLevel;
             break;
 
+          // Automatic semicolon insertion means we may scan across a newline
+          // and into the beginning of another statement.  If so, break out of
+          // the while loop and let the t.scanOperand logic handle errors.
+          case FUNCTION:
+          case IF: case SWITCH: case CASE: case DEFAULT:
+          case FOR: case WHILE: case DO: case BREAK: case CONTINUE:
+          case TRY: case CATCH: case FINALLY:
+          case THROW: case RETURN:
+          case WITH:
+          case VAR: case CONST:
+          case DEBUGGER:
+            break loop;
+
           default:
             throw t.newSyntaxError("Syntax error");
         }