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format/2 error #2790

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flexoron opened this issue Jan 23, 2025 · 3 comments
Open

format/2 error #2790

flexoron opened this issue Jan 23, 2025 · 3 comments

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@flexoron
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I didn't check whether this is a known issue or no issue:

?- A=[f|_], write(A), nl, format("~s",[A]), nl, write(A), nl.
[f|_61]
f
[f]        % unexpected, after format variable _61 = []
   A = "f" % unexpected
;  error(instantiation_error,must_be/2).
?-
@UWN
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UWN commented Jan 23, 2025 •
edited
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Shorter:

?- format("~s",[Nihil]).
   Nihil = [], unexpected
;  error(instantiation_error,must_be/2).
   instantiation_error. % expected, but not found directly

@flexoron
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Hint: Issue popped up while trying to answer issue #2788

triska added a commit to triska/scryer-prolog that referenced this issue Jan 23, 2025
@triska
FIXED: instantiation and type check for string arguments
bc0f614 
This addresses mthom#2790.

The issue first appeared in an example reported by @ak-1 in mthom#2788, and
was successfully analyzed by @flexoron. Many thanks!
@triska triska mentioned this issue Jan 23, 2025
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@triska
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triska commented Jan 23, 2025

Thank you a lot, this is absolutely an issue!

I have filed #2792 to address it, please have a look.

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3 participants
@flexoron @triska @UWN