{"action":"created","issue":{"url":"https://api.github.com/repos/rust-lang/rfcs/issues/1592","repository_url":"https://api.github.com/repos/rust-lang/rfcs","labels_url":"https://api.github.com/repos/rust-lang/rfcs/issues/1592/labels{/name}","comments_url":"https://api.github.com/repos/rust-lang/rfcs/issues/1592/comments","events_url":"https://api.github.com/repos/rust-lang/rfcs/issues/1592/events","html_url":"https://github.com/rust-lang/rfcs/pull/1592","id":151394198,"number":1592,"title":"all but the last field of a tuple must be Sized","user":{"login":"arielb1","id":1830974,"avatar_url":"https://avatars.githubusercontent.com/u/1830974?v=3","gravatar_id":"","url":"https://api.github.com/users/arielb1","html_url":"https://github.com/arielb1","followers_url":"https://api.github.com/users/arielb1/followers","following_url":"https://api.github.com/users/arielb1/following{/other_user}","gists_url":"https://api.github.com/users/arielb1/gists{/gist_id}","starred_url":"https://api.github.com/users/arielb1/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/arielb1/subscriptions","organizations_url":"https://api.github.com/users/arielb1/orgs","repos_url":"https://api.github.com/users/arielb1/repos","events_url":"https://api.github.com/users/arielb1/events{/privacy}","received_events_url":"https://api.github.com/users/arielb1/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/rust-lang/rfcs/labels/final-comment-period","name":"final-comment-period","color":"207de5"},{"url":"https://api.github.com/repos/rust-lang/rfcs/labels/T-lang","name":"T-lang","color":"bfd4f2"}],"state":"open","locked":false,"assignee":{"login":"nikomatsakis","id":155238,"avatar_url":"https://avatars.githubusercontent.com/u/155238?v=3","gravatar_id":"","url":"https://api.github.com/users/nikomatsakis","html_url":"https://github.com/nikomatsakis","followers_url":"https://api.github.com/users/nikomatsakis/followers","following_url":"https://api.github.com/users/nikomatsakis/following{/other_user}","gists_url":"https://api.github.com/users/nikomatsakis/gists{/gist_id}","starred_url":"https://api.github.com/users/nikomatsakis/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/nikomatsakis/subscriptions","organizations_url":"https://api.github.com/users/nikomatsakis/orgs","repos_url":"https://api.github.com/users/nikomatsakis/repos","events_url":"https://api.github.com/users/nikomatsakis/events{/privacy}","received_events_url":"https://api.github.com/users/nikomatsakis/received_events","type":"User","site_admin":false},"milestone":null,"comments":22,"created_at":"2016-04-27T14:04:11Z","updated_at":"2016-05-13T20:48:26Z","closed_at":null,"pull_request":{"url":"https://api.github.com/repos/rust-lang/rfcs/pulls/1592","html_url":"https://github.com/rust-lang/rfcs/pull/1592","diff_url":"https://github.com/rust-lang/rfcs/pull/1592.diff","patch_url":"https://github.com/rust-lang/rfcs/pull/1592.patch"},"body":"This oversight was found while working on rust-lang/rust#33138.\r\n\r\nTuples with an unsized field in the middle can't possibly work. Tuples with an unsized field at the end should work after we refactor `trans::adt`."},"comment":{"url":"https://api.github.com/repos/rust-lang/rfcs/issues/comments/219155314","html_url":"https://github.com/rust-lang/rfcs/pull/1592#issuecomment-219155314","issue_url":"https://api.github.com/repos/rust-lang/rfcs/issues/1592","id":219155314,"user":{"login":"ubsan","id":3479021,"avatar_url":"https://avatars.githubusercontent.com/u/3479021?v=3","gravatar_id":"","url":"https://api.github.com/users/ubsan","html_url":"https://github.com/ubsan","followers_url":"https://api.github.com/users/ubsan/followers","following_url":"https://api.github.com/users/ubsan/following{/other_user}","gists_url":"https://api.github.com/users/ubsan/gists{/gist_id}","starred_url":"https://api.github.com/users/ubsan/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ubsan/subscriptions","organizations_url":"https://api.github.com/users/ubsan/orgs","repos_url":"https://api.github.com/users/ubsan/repos","events_url":"https://api.github.com/users/ubsan/events{/privacy}","received_events_url":"https://api.github.com/users/ubsan/received_events","type":"User","site_admin":false},"created_at":"2016-05-13T20:48:26Z","updated_at":"2016-05-13T20:48:26Z","body":"@nikomatsakis Allowing passing DSTs as function parameters is pretty much the only place where we could allow it; elsewhere, unsized types are not allowed (for example, in returns). It would open an unnecessary lack of symmetry in the language, IMO."}}