PsiBuilder.Marker parseAssignmentForbiddingLambda(final PsiBuilder builder) {
    if (useNewImplementation) {
      return myNewExpressionParser.parse(builder, FORBID_LAMBDA_MASK);
    }
    return myOldExpressionParser.parseAssignment(builder, FORBID_LAMBDA_MASK);
  }
PsiBuilder.Marker parseAssignmentForbiddingLambda(final PsiBuilder builder)