{"action":"opened","issue":{"url":"https://api.github.com/repos/realworldocaml/book/issues/2771","repository_url":"https://api.github.com/repos/realworldocaml/book","labels_url":"https://api.github.com/repos/realworldocaml/book/issues/2771/labels{/name}","comments_url":"https://api.github.com/repos/realworldocaml/book/issues/2771/comments","events_url":"https://api.github.com/repos/realworldocaml/book/issues/2771/events","html_url":"https://github.com/realworldocaml/book/issues/2771","id":182682615,"number":2771,"title":"New comment on block [block-idm181620450032]","user":{"login":"Aweary","id":6886061,"avatar_url":"https://avatars.githubusercontent.com/u/6886061?v=3","gravatar_id":"","url":"https://api.github.com/users/Aweary","html_url":"https://github.com/Aweary","followers_url":"https://api.github.com/users/Aweary/followers","following_url":"https://api.github.com/users/Aweary/following{/other_user}","gists_url":"https://api.github.com/users/Aweary/gists{/gist_id}","starred_url":"https://api.github.com/users/Aweary/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Aweary/subscriptions","organizations_url":"https://api.github.com/users/Aweary/orgs","repos_url":"https://api.github.com/users/Aweary/repos","events_url":"https://api.github.com/users/Aweary/events{/privacy}","received_events_url":"https://api.github.com/users/Aweary/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2016-10-13T02:50:05Z","updated_at":"2016-10-13T02:50:05Z","closed_at":null,"body":"What does it mean you do `let () = { ... }`? Are you defining an anonymous function or something? Does this act as the `main` method? \n\n```\nlet () =\n  printf \"Total: %F\\n\" (read_and_accumulate 0.)\n```"}}
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