{"action":"created","issue":{"url":"https://api.github.com/repos/rust-lang/rfcs/issues/1199","labels_url":"https://api.github.com/repos/rust-lang/rfcs/issues/1199/labels{/name}","comments_url":"https://api.github.com/repos/rust-lang/rfcs/issues/1199/comments","events_url":"https://api.github.com/repos/rust-lang/rfcs/issues/1199/events","html_url":"https://github.com/rust-lang/rfcs/pull/1199","id":94359467,"number":1199,"title":"SIMD groundwork","user":{"login":"huonw","id":1203825,"avatar_url":"https://avatars.githubusercontent.com/u/1203825?v=3","gravatar_id":"","url":"https://api.github.com/users/huonw","html_url":"https://github.com/huonw","followers_url":"https://api.github.com/users/huonw/followers","following_url":"https://api.github.com/users/huonw/following{/other_user}","gists_url":"https://api.github.com/users/huonw/gists{/gist_id}","starred_url":"https://api.github.com/users/huonw/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/huonw/subscriptions","organizations_url":"https://api.github.com/users/huonw/orgs","repos_url":"https://api.github.com/users/huonw/repos","events_url":"https://api.github.com/users/huonw/events{/privacy}","received_events_url":"https://api.github.com/users/huonw/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/rust-lang/rfcs/labels/T-lang","name":"T-lang","color":"bfd4f2"}],"state":"open","locked":false,"assignee":{"login":"huonw","id":1203825,"avatar_url":"https://avatars.githubusercontent.com/u/1203825?v=3","gravatar_id":"","url":"https://api.github.com/users/huonw","html_url":"https://github.com/huonw","followers_url":"https://api.github.com/users/huonw/followers","following_url":"https://api.github.com/users/huonw/following{/other_user}","gists_url":"https://api.github.com/users/huonw/gists{/gist_id}","starred_url":"https://api.github.com/users/huonw/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/huonw/subscriptions","organizations_url":"https://api.github.com/users/huonw/orgs","repos_url":"https://api.github.com/users/huonw/repos","events_url":"https://api.github.com/users/huonw/events{/privacy}","received_events_url":"https://api.github.com/users/huonw/received_events","type":"User","site_admin":false},"milestone":null,"comments":24,"created_at":"2015-07-10T18:01:12Z","updated_at":"2015-07-21T15:24:53Z","closed_at":null,"pull_request":{"url":"https://api.github.com/repos/rust-lang/rfcs/pulls/1199","html_url":"https://github.com/rust-lang/rfcs/pull/1199","diff_url":"https://github.com/rust-lang/rfcs/pull/1199.diff","patch_url":"https://github.com/rust-lang/rfcs/pull/1199.patch"},"body":"[Rendered](https://github.com/huonw/rfcs/blob/simd/text/0000-simd-infrastructure.md)."},"comment":{"url":"https://api.github.com/repos/rust-lang/rfcs/issues/comments/123369283","html_url":"https://github.com/rust-lang/rfcs/pull/1199#issuecomment-123369283","issue_url":"https://api.github.com/repos/rust-lang/rfcs/issues/1199","id":123369283,"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},"created_at":"2015-07-21T15:24:53Z","updated_at":"2015-07-21T15:24:53Z","body":"I don't think the \"structual typing\" effect is too abstraction-breaking - you can only reach the abstraction-breakage if you declare an intrinsic with a \"specially-crafted\" signature, and declaring extern functions with \"specially-crafted\" signatures is already equivalent to a transmute (you can e.g. declare a pointer-sized identity function as `for<'a> foo(&'a Foo) -> &'a Bar`).\r\n\r\nThe \"monomorphization-error\" part is a bit more annoying. I prefer to think of it as undefined behaviour detected as compile-time (monomorphized unsafe code can of-course exhibit guaranteed UB even without intrinsics). Theoretically, we could just emit an `intrinsics::unreachable()` - this can even be part of a useful program, if the UB isn't actually reachable - but we prefer to abort compilation."}}