[plt-scheme] required else for if ?

From: Noel Welsh (noelwelsh at gmail.com)
Date: Sun Sep 6 15:35:44 EDT 2009

On Sun, Sep 6, 2009 at 8:07 PM, Doug Evans<dje at sebabeach.org> wrote:

> How come the default behaviour of `if' in mzscheme is to
> require the else clause,
> and not have an optional else clause?

This is one of the changes made in the v3 -> v4 transition. It is
designed to prevent a class of bugs. The mzscheme language provides
backwards compatibility.


Posted on the users mailing list.