Re: definitions in macros?

[Han-Wen Nienhuys <hanwenn@gmail.com>]

On Sun, Mar 22, 2020 at 10:09 PM David Kastrup <dak@gnu.org> wrote:
> > In the code below, it looks like only one of the two definitions in
> > the body of my-macro-new takes effect. Is this expected, and if so,
> > why?
> >
> > (defmacro-public my-macro-old (command-and-args . definition)
> >   (module-define! (current-module) 'x1 "I am X1\n")
> >   (module-define! (current-module) 'x2 "I am X2\n"))
> >
> > (defmacro-public my-macro-new (command-and-args . definition)
> >     `(define p "i am P\n")
> >     `(define q "i am Q\n"))
>
> This is very much expected.  The macro body contains two side-effect
> free expressions (namely quoted lists) and returns the last one which is
..
> You probably wanted something like
>   `(begin (define p ...) (define q ...))

d'oh! I am an idiot.

Thanks,

-- 
Han-Wen Nienhuys - hanwenn@gmail.com - http://www.xs4all.nl/~hanwen