{"action":"opened","issue":{"url":"https://api.github.com/repos/dtolnay/syn/issues/32","repository_url":"https://api.github.com/repos/dtolnay/syn","labels_url":"https://api.github.com/repos/dtolnay/syn/issues/32/labels{/name}","comments_url":"https://api.github.com/repos/dtolnay/syn/issues/32/comments","events_url":"https://api.github.com/repos/dtolnay/syn/issues/32/events","html_url":"https://github.com/dtolnay/syn/issues/32","id":181707727,"number":32,"title":"Implement ConstExpr distinct from Expr","user":{"login":"dtolnay","id":1940490,"avatar_url":"https://avatars.githubusercontent.com/u/1940490?v=3","gravatar_id":"","url":"https://api.github.com/users/dtolnay","html_url":"https://github.com/dtolnay","followers_url":"https://api.github.com/users/dtolnay/followers","following_url":"https://api.github.com/users/dtolnay/following{/other_user}","gists_url":"https://api.github.com/users/dtolnay/gists{/gist_id}","starred_url":"https://api.github.com/users/dtolnay/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dtolnay/subscriptions","organizations_url":"https://api.github.com/users/dtolnay/orgs","repos_url":"https://api.github.com/users/dtolnay/repos","events_url":"https://api.github.com/users/dtolnay/events{/privacy}","received_events_url":"https://api.github.com/users/dtolnay/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2016-10-07T16:03:58Z","updated_at":"2016-10-07T16:03:58Z","closed_at":null,"body":"This is the subset of expressions that are allowed to be used in array lengths and enum discriminants. The authoritative list is in [`eval_const_expr_partial`](https://github.com/rust-lang/rust/blob/e51190cf07eb4e817d35c7d45eb89ec5a1ae8ddc/src/librustc_const_eval/eval.rs#L594)."}}
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