[ sisc-Bugs-1769860 ] Unquoted parameter objects in eval get applied twice

Bugs item #1769860, was opened at 2007-08-08 10:56
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Friedrich Delgado Friedrichs (taupan)
Assigned to: Nobody/Anonymous (nobody)
Summary: Unquoted parameter objects in eval get applied twice

Initial Comment:
Yet another bug in connection with eval...


SISC (1.16.6)
#;> (define env (scheme-report-environment 5))
#;> (define foo (make-parameter 'bar))
#;> (eval `',foo  env)
#<parameter>
; looks good so far?
#;> (eval `(',foo)  env)
Error: attempt to apply non-procedure 'bar'.

;; the unquoted procedure gets applied twice?

;; Here's a workaround:

#;> (eval `(define  (foo) ,foo) env)
#;> (parameterize ((foo 'goo)) (eval '((foo)) env))
goo

;; Ugly, but works...

I'm told that using literal procedures in quasiquoted lists is heavily unportable, but sisc allows it, and it's the best solution to use parameter objects for a particular problem that I needed to solve.

As an aside, I hope to find some time later to research integrating my code with the Java API for the compiler/analyzer so I won't have to use eval that heavily any more.

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