This method is deprecated or moved on the latest stable version.
The last existing version (v2_2_9) is shown here.
unget()
public
Returns the current token to the token stream
# File lib/rdoc/markup/parser.rb, line 550
def unget
token = @current_token
p :unget => token if @debug
raise Error, 'too many #ungets' if token == @tokens.first
@tokens.unshift token if token
end