{"action":"opened","issue":{"url":"https://api.github.com/repos/rust-lang/rust/issues/33185","repository_url":"https://api.github.com/repos/rust-lang/rust","labels_url":"https://api.github.com/repos/rust-lang/rust/issues/33185/labels{/name}","comments_url":"https://api.github.com/repos/rust-lang/rust/issues/33185/comments","events_url":"https://api.github.com/repos/rust-lang/rust/issues/33185/events","html_url":"https://github.com/rust-lang/rust/issues/33185","id":150704428,"number":33185,"title":"ICE: unprintable span","user":{"login":"Manishearth","id":1617736,"avatar_url":"https://avatars.githubusercontent.com/u/1617736?v=3","gravatar_id":"","url":"https://api.github.com/users/Manishearth","html_url":"https://github.com/Manishearth","followers_url":"https://api.github.com/users/Manishearth/followers","following_url":"https://api.github.com/users/Manishearth/following{/other_user}","gists_url":"https://api.github.com/users/Manishearth/gists{/gist_id}","starred_url":"https://api.github.com/users/Manishearth/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Manishearth/subscriptions","organizations_url":"https://api.github.com/users/Manishearth/orgs","repos_url":"https://api.github.com/users/Manishearth/repos","events_url":"https://api.github.com/users/Manishearth/events{/privacy}","received_events_url":"https://api.github.com/users/Manishearth/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2016-04-24T21:59:55Z","updated_at":"2016-04-24T21:59:55Z","closed_at":null,"body":"```rust\r\n#[macro_export]\r\nmacro_rules! state {\r\n\t( $( $name:ident : $field:ty )* ) => (\r\n\t\t#[derive(Default)]\r\n\t\tstruct State {\r\n\t\t\t$($name : $field),*\r\n\t\t}\r\n\t)\r\n}\r\n\r\nstate! { x: i64 }\r\n\r\npub fn main() {\r\n}\r\n```\r\n\r\ngives:\r\n\r\n```\r\n<anon>:11:11: 6:20 warning: struct field is never used: `x`, #[warn(dead_code)] on by default\r\n(internal compiler error: unprintable span)\r\n<anon>:11:1: 11:18 note: in this expansion of state! (defined in <anon>)\r\n```\r\n\r\n(no backtrace)"}}