Michael N. Livshin <mike@nospam.olan.com> wrote [edited for brevity]:
+---------------
| Which of the two is correct?
| 1) STk way: (call/cc (lambda (exit) (exit (values 1 2))))
| 2) SCSH way: (call/cc (lambda (exit) (exit 1 2)))
| BTW, SCSH's `values' also checks its arguments for not being multiple-valued.
+---------------
MzScheme agrees with "scsh", and throws an error on the "STk" version:
> (call/cc (lambda (exit) (exit 1 2)))
1
2
> (call/cc (lambda (exit) (exit (values 1 2))))
context expected 1 value, received 2 values: 1 2
>
For what it's worth, MzScheme's documentation is at least explicit about it:
[section on call/cc]
"Multiple return values can be passed to a continuation"
[section on multiple values]
"An expression used in a procedure application (either as the
procedure to be applied or one of the arguments) must always
return a single value."
...
"When the number of values returned by an expression does not
match the number of values expected by the expression's context,
the EXN:APPLICATION:ARITY exception is raised (at run-time)."
-Rob
-----
Rob Warnock, 7L-551 rpw3@sgi.com http://reality.sgi.com/rpw3/
Silicon Graphics, Inc. Phone: 650-933-1673 [New area code!]
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