[m-users.] Predicate inside of maybe ?

[Zoltan Somogyi]

On Tue, 27 Sep 2022 11:57:15 +0200, Volker Wysk <post at volker-wysk.de> wrote:
> How should this be done?

The getopt module of the standard library has several examples.
It is in the library reference manual.

Zoltan.