I need more readable error message for undefined function.
e.g. "Xslate(:1 &main[2]): Undefined subroutine &unknown called" is even better.
% xslate --eval "[% unknown() %]" --syntax TTerse
Xslate(:1 &main[2]): Use of uninitialized value in subroutine entry at /usr/local/app/perl-5.12.1/bin//xslate line 107.
Xslate(:1 &main[2]): Functions must be a CODE reference, not nil at /usr/local/app/perl-5.12.1/bin//xslate line 107.
I need more readable error message for undefined function. e.g. "Xslate(:1 &main[2]): Undefined subroutine &unknown called" is even better.