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Re: [PATCH] Move ambitus print callback to scheme

From: Nicolas Sceaux
Subject: Re: [PATCH] Move ambitus print callback to scheme
Date: Sat, 29 Aug 2009 10:16:26 +0200

Le 29 août 09 à 06:56, David Kastrup a écrit :

Carl Sorensen <address@hidden> writes:

On Aug 28, 2009, at 1:16 PM, "Nicolas Sceaux" <address@hidden>

According to R5RS, it is an error to modify a literal list.
If a function returns '(), the caller won't be allowed to
apply a modifying function on the result (eg. append!)

IIUC, '() is not a literal list, but a constant that represents the
empty list.

It is a literal list in my opinion, but one that happens to have no
unique and/or modifiable conses.  Append will work just fine on it.

However, guile does not report modifying a literal list as an error,
and actually modifies it, so this is somewhat rhetorical.

It is not rhetorical since a modified literal list will actually stay
modified when you call the function the next time.  Can't happen with
'() though.

You're right on both points! thanks.

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