String literals in %token, where are they stored?

I was going through some old emails looking for another topic when I =
came across a post by Christian Schoenebeck:

> That even seems to work in combination with type specifiers and string=20=

> literals:
>=20
> %token <sval> ONE "one"
> %token <ival> TWO "two"
> %token <dval> THREE "three"


I had skipped over this bit, but now I think I need to understand it.

First, consider these definitions in .y:

%token FOR
%token TO "->"
%token STROP 1000 "step"

Reading the "Token Kind Names" doc, and tables.h, I am not clear where =
these bits end up.

I assume the first item, "FOR", "TO" and "STROP", end up in yytname, and =
that in this case we might expect to see something like 280, 281 and =
1000 in yytoknum. Is that correct?

If so, where are the string literals stored? Is there a collection I can =
iterate? Or is there some way I can get to them through yytname or =
yytoknum?

If there is an easy way to iterate over these literals, it seems it =
could fix a very thorny problem I've been thinking about for some time.