# File lib/rufus/treechecker.rb, line 471
    def exclude_global_vars

      @current_set.accept_pattern([ :gvar, :$! ])
        # "rescue => e" is accepted

      @current_set.exclude_symbol(:gvar, 'global vars are forbidden')
      @current_set.exclude_symbol(:gasgn, 'global vars are forbidden')
    end