Don't define global variables
Don't define global variables

It's kind of encouraging a bad practice, so let's just use the variables
predefined in Ruby. It also removes some warnings of undefined
variables.

miamiruby/byebug,deivid-rodriguez/byebug,scalp42/byebug,k0kubun/byebug,os97673/byebug,ozydingo/byebug,scalp42/byebug,deivid-rodriguez/byebug,guilherme/byebug,saisai/byebug,miamiruby/byebug,yui-knk/byebug,saisai/byebug,webdev1001/byebug,icebreaker/byebug,yui-knk/byebug,guilherme/byebug,icebreaker/byebug,deivid-rodriguez/byebug,guilherme/byebug,yui-knk/byebug,ozydingo/byebug,k0kubun/byebug,os97673/byebug,k0kubun/byebug,webdev1001/byebug