A good night for an additional round of #lipogrammaticprogramming
Back to my quixotic goal: build a Ruby without that fifth glyph. A smart Ruby pal points to a good doc on 1.8.x: http://edwinmeyer.com/Integrated_RHG.html
First thing is probably to modify yacc logic: http://edwinmeyer.com/Release_Integrated_RHG_09_10_2008/chapter09.html
Built a miniruby with 'yass' as its word for truth! Syntax is OK, but it won't run.
(Pardon my bad symbols, programming is a dirty job)