[Larceny-users] (srfi :39 parameters) parameterize evaluating parameter expressions too many times

[Derick Eddington]

According to SRFI 39, the parameter expressions must be evaluated only
once per parameterize evaluation.

Larceny v0.97a4 (alpha test) (Mar 17 2009 11:29:20, precise:Linux:unified)
larceny.heap, built on Tue Mar 17 11:33:15 PDT 2009
ERR5RS mode (no libraries have been imported)

(import

(rnrs base)
(rnrs io simple)
(srfi :39 parameters))
Autoloading (srfi :39 parameters)

(define k)
(define p (make-parameter 1))
(parameterize (((begin (display "param expr\n") p)

(begin (display "value expr\n") 2)))
(call/cc (lambda (cc) (set! k cc) 'first)))
value expr
param expr
param expr
param expr
param expr
first

(k 'second)

param expr
param expr
param expr
param expr
second

[William D Clinger]

Post by Derick Eddington
According to SRFI 39, the parameter expressions must be evaluated only
once per parameterize evaluation.

Thank you for reporting bugs in Larceny.

This one was logged as ticket #620, and fixed by
changeset:6145.

Will