Consider this sample routine: (Yes, there are better ways of making it light everywhere. This is just for example.)
The code generates an error message at run time, but there is no reason it should.
The correct behavior is to give every object without a parent light.
(Yes, this causes problems if there are items out-of-play. Maybe there aren't.) The compiler is using an optimized version of objectloop
where the loop follows the eldest child and proceeds through the siblings.
It is illegal to find the child of nothing, and that is why an error occurs.
If this is a problem, modify the control expression so it is not in the "x in y" form,
such as objectloop (x && x in nothing).
About Patches
Issue C62120
(X in nothing) objectloop fails
Submitted by: Eric Schmidt
Appeared in: Compiler 6.21 or before
Fixed in: -
Problem
[ Initialise x;
location = livingroom;
objectloop (x in nothing) give x light;
"What a mess is it here after that party!
And your relatives arrive in just a few
hours...";
];
Workaround
Last updated 17 April 2013.
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