Problem:
A Perl stack track is difficult to parse with my inferior human brain; I want to align each line horizontally so that discrepancies jump out at me.
Solution:
This isn't the whole solution, but it goes some way towards it.
perl script.pl | grep -v ^eval | perl -plne'$len=300-length($_); $space=" "x$len; s/called at /${space}called at /'