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Better error message in case of wrong structure definition order #104

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Merged
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Aug 7, 2020
Merged

Better error message in case of wrong structure definition order #104

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3 changes: 2 additions & 1 deletion hb.elpi
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Original file line number Diff line number Diff line change
Expand Up @@ -494,8 +494,9 @@ distinct-pairs-below CurrentClass AllSuper C1 C2 :-
pred assert-building-bottom-up i:class, i:classname.
assert-building-bottom-up CurrentClass C3n :-
class-def (class C3n X Y),
CurrentClass = class CC _ _,
if (not (sub-class? CurrentClass (class C3n X Y)))
(coq.error "You must declare" CurrentClass "before" C3n)
(coq.error "You must declare the current class" CC "before" C3n)
true.

pred distinct-pairs_pair i:prop, o:pair class class.
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