{"action":"created","issue":{"url":"https://api.github.com/repos/septract/starling-tool/issues/111","repository_url":"https://api.github.com/repos/septract/starling-tool","labels_url":"https://api.github.com/repos/septract/starling-tool/issues/111/labels{/name}","comments_url":"https://api.github.com/repos/septract/starling-tool/issues/111/comments","events_url":"https://api.github.com/repos/septract/starling-tool/issues/111/events","html_url":"https://github.com/septract/starling-tool/issues/111","id":192343750,"number":111,"title":"Underscore placeholder variable","user":{"login":"septract","id":220662,"avatar_url":"https://avatars.githubusercontent.com/u/220662?v=3","gravatar_id":"","url":"https://api.github.com/users/septract","html_url":"https://github.com/septract","followers_url":"https://api.github.com/users/septract/followers","following_url":"https://api.github.com/users/septract/following{/other_user}","gists_url":"https://api.github.com/users/septract/gists{/gist_id}","starred_url":"https://api.github.com/users/septract/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/septract/subscriptions","organizations_url":"https://api.github.com/users/septract/orgs","repos_url":"https://api.github.com/users/septract/repos","events_url":"https://api.github.com/users/septract/events{/privacy}","received_events_url":"https://api.github.com/users/septract/received_events","type":"User","site_admin":false},"labels":[{"id":270827445,"url":"https://api.github.com/repos/septract/starling-tool/labels/enhancement","name":"enhancement","color":"84b6eb","default":true}],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":1,"created_at":"2016-11-29T17:14:59Z","updated_at":"2016-11-29T18:20:38Z","closed_at":"2016-11-29T18:20:38Z","body":"It would be useful to be able to write `_` for an existentially-quantified placeholder. Eg. in `lclist-grasshopper`: \r\n```\r\n{| isList(v) * has1Lock(curr, _) * isVal(curr, cv) |}\r\n```\r\n\r\nRight now I'm declaring `_` as a named variable, but this doesn't have the right semantics. E.g. \r\n```\r\n{| foo(x,_) * bar(y,_) |} \r\n```\r\nThis requires the second arguments of foo and bar to be equal. \r\n\r\nThis is a relatively safe use of existential quantification (basically a 'don't-care' quantification) so it shouldn't blow up Z3 or HSF. \r\n\r\nHow hard would it be to add this, @CaptainHayashi? "},"comment":{"url":"https://api.github.com/repos/septract/starling-tool/issues/comments/263653297","html_url":"https://github.com/septract/starling-tool/issues/111#issuecomment-263653297","issue_url":"https://api.github.com/repos/septract/starling-tool/issues/111","id":263653297,"user":{"login":"CaptainHayashi","id":374963,"avatar_url":"https://avatars.githubusercontent.com/u/374963?v=3","gravatar_id":"","url":"https://api.github.com/users/CaptainHayashi","html_url":"https://github.com/CaptainHayashi","followers_url":"https://api.github.com/users/CaptainHayashi/followers","following_url":"https://api.github.com/users/CaptainHayashi/following{/other_user}","gists_url":"https://api.github.com/users/CaptainHayashi/gists{/gist_id}","starred_url":"https://api.github.com/users/CaptainHayashi/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/CaptainHayashi/subscriptions","organizations_url":"https://api.github.com/users/CaptainHayashi/orgs","repos_url":"https://api.github.com/users/CaptainHayashi/repos","events_url":"https://api.github.com/users/CaptainHayashi/events{/privacy}","received_events_url":"https://api.github.com/users/CaptainHayashi/received_events","type":"User","site_admin":false},"created_at":"2016-11-29T18:20:38Z","updated_at":"2016-11-29T18:20:38Z","body":"Duplicate of #28, I think.  Will comment on there."}}
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