{"action":"created","issue":{"url":"https://api.github.com/repos/SWI-Prolog/swipl-devel/issues/99","labels_url":"https://api.github.com/repos/SWI-Prolog/swipl-devel/issues/99/labels{/name}","comments_url":"https://api.github.com/repos/SWI-Prolog/swipl-devel/issues/99/comments","events_url":"https://api.github.com/repos/SWI-Prolog/swipl-devel/issues/99/events","html_url":"https://github.com/SWI-Prolog/swipl-devel/issues/99","id":124129914,"number":99,"title":"Uninformative warning","user":{"login":"borisvassilev","id":419678,"avatar_url":"https://avatars.githubusercontent.com/u/419678?v=3","gravatar_id":"","url":"https://api.github.com/users/borisvassilev","html_url":"https://github.com/borisvassilev","followers_url":"https://api.github.com/users/borisvassilev/followers","following_url":"https://api.github.com/users/borisvassilev/following{/other_user}","gists_url":"https://api.github.com/users/borisvassilev/gists{/gist_id}","starred_url":"https://api.github.com/users/borisvassilev/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/borisvassilev/subscriptions","organizations_url":"https://api.github.com/users/borisvassilev/orgs","repos_url":"https://api.github.com/users/borisvassilev/repos","events_url":"https://api.github.com/users/borisvassilev/events{/privacy}","received_events_url":"https://api.github.com/users/borisvassilev/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":1,"created_at":"2015-12-28T21:32:12Z","updated_at":"2015-12-29T11:16:10Z","closed_at":null,"body":"I don't even know how to name this issue.... This is a minimal reproducible example. This is the file `foo.pl`:\r\n\r\n    foo :- maplist([_], []).\r\n\r\nWhen you just consult it, everything seems fine (even though I am not sure what it is supposed to mean). Then, upon `make`:\r\n\r\n    $ swipl\r\n    Welcome to SWI-Prolog (Multi-threaded, 64 bits, Version 7.3.14-2-g2f7cf13)\r\n    Copyright (c) 1990-2015 University of Amsterdam, VU Amsterdam\r\n    SWI-Prolog comes with ABSOLUTELY NO WARRANTY. This is free software,\r\n    and you are welcome to redistribute it under certain conditions.\r\n    Please visit http://www.swi-prolog.org for details.\r\n    \r\n    For help, use ?- help(Topic). or ?- apropos(Word).\r\n    \r\n    ?- [foo].\r\n    true.\r\n    \r\n    ?- make.\r\n    Warning: Unknown message: extended_pos(list_position(19,22,[20-21],none),1)\r\n    Warning: Unknown message: extended_pos(list_position(19,22,[20-21],none),1)\r\n    true.\r\n\r\n"},"comment":{"url":"https://api.github.com/repos/SWI-Prolog/swipl-devel/issues/comments/167767582","html_url":"https://github.com/SWI-Prolog/swipl-devel/issues/99#issuecomment-167767582","issue_url":"https://api.github.com/repos/SWI-Prolog/swipl-devel/issues/99","id":167767582,"user":{"login":"JanWielemaker","id":3071146,"avatar_url":"https://avatars.githubusercontent.com/u/3071146?v=3","gravatar_id":"","url":"https://api.github.com/users/JanWielemaker","html_url":"https://github.com/JanWielemaker","followers_url":"https://api.github.com/users/JanWielemaker/followers","following_url":"https://api.github.com/users/JanWielemaker/following{/other_user}","gists_url":"https://api.github.com/users/JanWielemaker/gists{/gist_id}","starred_url":"https://api.github.com/users/JanWielemaker/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/JanWielemaker/subscriptions","organizations_url":"https://api.github.com/users/JanWielemaker/orgs","repos_url":"https://api.github.com/users/JanWielemaker/repos","events_url":"https://api.github.com/users/JanWielemaker/events{/privacy}","received_events_url":"https://api.github.com/users/JanWielemaker/received_events","type":"User","site_admin":false},"created_at":"2015-12-29T11:16:10Z","updated_at":"2015-12-29T11:16:10Z","body":"It can't do the position logic.  Would be feasible to add, but given that the program doesn't make much sense in the first place I won't put that high on the agenda."}}