Translation – Another Print Function Issue

While the new reference mode was being implemented, some problems were discovered in the code that carefully constructed statements would exploit giving incorrect results. The first problem statement was:

TAB(10)=A

This caused a “command stack empty for expression” bug error. This should have been “expecting command” error. The check was if the command stack was empty or there was a PRINT command on top of the command stack or if the top of the hold stack was not empty (except for the null token).

The error occurred when trying to get the type of expression because the hold stack was empty (first item to figure out the expression type) so it when to the command stack, which was also empty. This check should not have caught this because there was a check after this with for catching all internal functions in command mode. The check was modified to if the command stack is not empty and if there is a PRINT on top of the command stack or the hold stack is not empty.