Re: Feature request: Expose `ellipsis?' from psyntax.ss

["Marc Nieper-Wißkirchen" <marc@nieper-wisskirchen.de>]

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> Now to R6RS. Section 6.4 says that auxiliary syntax describes a syntax
> binding. Section 12.4 of the R6RS Library Report defines `...' as auxiliary
> syntax. The example definition of `case' in Section 12.5 ibid. shows
> explicitely that auxiliary keywords are matched using `free-identifier=?'
> (in this example, `else'). Also, in all other regards with respect to
> auxiliary syntax R6RS does not differ from R7RS.
>

P.S.: I just noticed that Guile does not export `...' from (rnrs base),
which is an incompatiblity to the R6RS that is not mentioned by the
following list, I think:
https://www.gnu.org/software/guile/manual/html_node/R6RS-Incompatibilities.html#R6RS-Incompatibilities.
Likewise, identifiers like `else' and `=>' are not exported by the Guile
version of `(rnrs base)'. Oddly enough, other auxiliary syntax like
`unquote' is being bound.

It is probably enough to create the missing bindings around these lines in
psyntax.scm:
http://git.savannah.gnu.org/cgit/guile.git/tree/module/ice-9/psyntax.scm#n3230
and to export the bindings from `(guile)', `(rnrs base)', `(rnrs)', etc.

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