* src/reader.c (copy_at, copy_dollarm parse_braces, parse_action)

(parse_guard): Rename the formal argument `stack_offset' as
`rule_length', which is more readable.
Adjust callers.
(copy_at, copy_dollar): Instead of outputting the hard coded
values of $$, $n and so forth, output invocation to b4_lhs_value,
b4_lhs_location, b4_rhs_value, and b4_rhs_location.
* data/bison.simple, data/bison.c++ (b4_lhs_value)
(b4_lhs_location, b4_rhs_value, and b4_rhs_location: New.

TODO

@@ -1,6 +1,5 @@
 -*- outline -*-
 
-
 * Several %unions
 I think this is a pleasant (but useless currently) feature, but in the
 future, I want a means to %include other bits of grammars, and _then_