Introduced *argument-stream*.

[informatimago]

Introduced the *argument-stream* variable, bound while evaluating
expressions from slime, to the string-stream where the expression is
read from. This allows the expression to further read from this
stream, to take additional arguments.

EXAMPLE:  Type in *slime-repl*:
              (* 2 (read swank:*argument-stream*))  21  RET
          --> 42

More typical example, using a symbol macro:

cl-user> (defun command-test ()
           (let ((token (read swank:*argument-stream*)))
             (print (list token token)))
           (values))
command-test
cl-user> (define-symbol-macro cmdt (command-test))
cmdt
cl-user> (command-test) 42

(42 42) 
; No value
cl-user> cmdt 42

(42 42) 
; No value
cl-user>

[informatimago]

Both changes can be accepted: symbols were added from different patches.

[luismbo]

This seems pretty niche, which is both a pro and a con. :-D *argument-stream* seems like a weird name, that only makes sense for this specific use-case. How about *eval-region-stream* instead?

[informatimago]

Whatever the name. The functionality is useful.

[stassats]

I don't like additional code burden for marginally useful features that few people will know about and even fewer will use it.

[informatimago]

I don't like additional code burden for marginally useful features that few people will know about and even fewer will use it.

What code burden? This is simply making a lexical variable global dynamic, and exporting the symbol!