{"action":"created","issue":{"url":"https://api.github.com/repos/ldionne/hana/issues/144","labels_url":"https://api.github.com/repos/ldionne/hana/issues/144/labels{/name}","comments_url":"https://api.github.com/repos/ldionne/hana/issues/144/comments","events_url":"https://api.github.com/repos/ldionne/hana/issues/144/events","html_url":"https://github.com/ldionne/hana/issues/144","id":89819887,"number":144,"title":"Add a rationale for using tag-dispatching and a two-layer dispatching system","user":{"login":"ldionne","id":700834,"avatar_url":"https://avatars.githubusercontent.com/u/700834?v=3","gravatar_id":"","url":"https://api.github.com/users/ldionne","html_url":"https://github.com/ldionne","followers_url":"https://api.github.com/users/ldionne/followers","following_url":"https://api.github.com/users/ldionne/following{/other_user}","gists_url":"https://api.github.com/users/ldionne/gists{/gist_id}","starred_url":"https://api.github.com/users/ldionne/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ldionne/subscriptions","organizations_url":"https://api.github.com/users/ldionne/orgs","repos_url":"https://api.github.com/users/ldionne/repos","events_url":"https://api.github.com/users/ldionne/events{/privacy}","received_events_url":"https://api.github.com/users/ldionne/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/ldionne/hana/labels/documentation","name":"documentation","color":"fad8c7"},{"url":"https://api.github.com/repos/ldionne/hana/labels/enhancement","name":"enhancement","color":"84b6eb"}],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":9,"created_at":"2015-06-20T21:25:36Z","updated_at":"2015-06-21T14:55:51Z","closed_at":"2015-06-20T21:48:57Z","body":""},"comment":{"url":"https://api.github.com/repos/ldionne/hana/issues/comments/113911353","html_url":"https://github.com/ldionne/hana/issues/144#issuecomment-113911353","issue_url":"https://api.github.com/repos/ldionne/hana/issues/144","id":113911353,"user":{"login":"ldionne","id":700834,"avatar_url":"https://avatars.githubusercontent.com/u/700834?v=3","gravatar_id":"","url":"https://api.github.com/users/ldionne","html_url":"https://github.com/ldionne","followers_url":"https://api.github.com/users/ldionne/followers","following_url":"https://api.github.com/users/ldionne/following{/other_user}","gists_url":"https://api.github.com/users/ldionne/gists{/gist_id}","starred_url":"https://api.github.com/users/ldionne/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ldionne/subscriptions","organizations_url":"https://api.github.com/users/ldionne/orgs","repos_url":"https://api.github.com/users/ldionne/repos","events_url":"https://api.github.com/users/ldionne/events{/privacy}","received_events_url":"https://api.github.com/users/ldionne/received_events","type":"User","site_admin":false},"created_at":"2015-06-21T14:55:51Z","updated_at":"2015-06-21T14:55:51Z","body":"> I see the following kind of trait declaration\r\n> \r\n> [...]\r\n>\r\n> How this check the syntactical constraint?\r\n\r\nThis just checks that either `chain_impl<M>` or `flatten_impl<M>` are implemented. We have to rely on the user providing a valid definition of the nested `apply`, but we can't check for that because that would execute the algorithm."}}