extension support for Context
# File irb/extend-command.rb, line 211
def self.def_extend_command(cmd_name, load_file, *aliases)
Context.module_eval %[
def #{cmd_name}(*opts, &b)
Context.module_eval {remove_method(:#{cmd_name})}
require "#{load_file}"
send :#{cmd_name}, *opts, &b
end
for ali in aliases
alias_method ali, cmd_name
end
]
end