Bug#256696: ~@; FORMAT directive is not implemented (CLtS 22.3.5.2)

[Eric Marsden]

Package: gclcvs
Version: 2.7.0-24

GCL in ANSI mode does not implement the ~@; directive within a
Tilde-Less-Than-Sign format directive (as per CLtS 22.3.5.2).
The following REPL interaction demonstrates the problem:

,----
| > (format nil "~@<;; ~@;~s~:>" *features*)
| Error in FORMAT [or a callee]: Format error: ~; expected.
| V
| "~@<;; ~@;~s~:>"
`----

Quote from the relevant part of the ANSI Common Lisp specification:

,---- http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_22-3-5-2.html
| The control-string portion enclosed by ~<...~:> can be divided into
| segments ~<prefix~;body~;suffix~:> by ~; directives. If the first
| section is terminated by ~@;, it specifies a per-line prefix rather
| than a simple prefix. The prefix and suffix cannot contain format
| directives. An error is signaled if either the prefix or suffix fails
| to be a constant string or if the enclosed portion is divided into
| more than three segments.
`----

--
Eric Marsden <URL:http://www.laas.fr/~emarsden/>

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