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freeze/2 spooky backtracking #44

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infradig opened this issue Sep 26, 2022 · 1 comment
Closed

freeze/2 spooky backtracking #44

infradig opened this issue Sep 26, 2022 · 1 comment

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@infradig
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infradig commented Sep 26, 2022 •
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Correct...

$ tpl
?- freeze(Y,write(ok)),(X=Y;true),Y=123.
ok   Y = 123, X = Y
; ok Y = 123.
?- $ tpl

Incorrect...

?- _=[X,Y],freeze(Y,write(ok)),(X=Y;true),Y=123.
ok   X = 123, Y = X
; ok Y = 123, freeze:freeze(X,write(ok)).
?-
@infradig infradig changed the title freeze/2 spooky behaviour freeze/2 spooky backtracking Sep 26, 2022
@infradig
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More...

$ tpl
?- freeze(Y,write(ok)),(true;true).
   freeze:freeze(Y,write(ok))
;  true.
?-

On backtracking Y should still be frozen.

infradig added a commit that referenced this issue Sep 26, 2022
@infradig
Fix for freeze/2 second example, re issue #44
d5b68db
infradig added a commit that referenced this issue Sep 26, 2022
@infradig
Fix for freeze/2 first example, re issue #44
85b35c0
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@infradig