{"action":"opened","issue":{"url":"https://api.github.com/repos/rust-lang/rust/issues/50408","repository_url":"https://api.github.com/repos/rust-lang/rust","labels_url":"https://api.github.com/repos/rust-lang/rust/issues/50408/labels{/name}","comments_url":"https://api.github.com/repos/rust-lang/rust/issues/50408/comments","events_url":"https://api.github.com/repos/rust-lang/rust/issues/50408/events","html_url":"https://github.com/rust-lang/rust/issues/50408","id":319778221,"number":50408,"title":"concat_idents cannot be used in pattern position","user":{"login":"ExpHP","id":1411280,"avatar_url":"https://avatars0.githubusercontent.com/u/1411280?v=4","gravatar_id":"","url":"https://api.github.com/users/ExpHP","html_url":"https://github.com/ExpHP","followers_url":"https://api.github.com/users/ExpHP/followers","following_url":"https://api.github.com/users/ExpHP/following{/other_user}","gists_url":"https://api.github.com/users/ExpHP/gists{/gist_id}","starred_url":"https://api.github.com/users/ExpHP/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ExpHP/subscriptions","organizations_url":"https://api.github.com/users/ExpHP/orgs","repos_url":"https://api.github.com/users/ExpHP/repos","events_url":"https://api.github.com/users/ExpHP/events{/privacy}","received_events_url":"https://api.github.com/users/ExpHP/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2018-05-03T03:33:57Z","updated_at":"2018-05-03T03:33:57Z","closed_at":null,"author_association":"CONTRIBUTOR","body":"* The three places where an ident-returning macro can be used are patterns, types, and expressions.\r\n* The two places where `concat_idents` can be used are types and expressions.\r\n* **_Hmmmm._**\r\n\r\nI looked around previous issues and PRs related to `concat_idents` and the word \"pattern\" never even comes up.  This seems to be an accidental omission."}}
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