It could be the case that not all errors in the program are reported about sandbox HOT 6 CLOSED

When Tau Prolog doesn't show any output it's because there is a JavaScript error. You can see it in the browser console (for future issues).

We don't have implemented the export/1 directive yet.

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@jariazavalverde: Please have a look at the way how SICStus offers module. ((The module standard itself permits a lot of incarnations. SICStus would be one, too))

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@UWN Sorry, but the error has nothing to do with module system,
and SICstus will not be of any help here. Already modules are not mentioned in the
title of the error "It could be the case that not all errors in the program are reported".

The error is in what the toplevel shows when the program is not accepted:

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The problem is that not all browsers have an error console. For example I don't find one in the Safari Browser so easily. I just checked on a MacBook. You need to separately enable it:

https://www.technipages.com/macos-enable-web-inspector-in-safari

SWISH just lists errors in the toplevel, and you can click them to get into the source:

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@UWN Also SICStus Prolog seems to not implement this part of
the ISO module standard, I get the following result:

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@jburse, see 6.4.4.2 of 13211-2

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