{"action":"opened","issue":{"url":"https://api.github.com/repos/ValeevGroup/tiledarray/issues/47","labels_url":"https://api.github.com/repos/ValeevGroup/tiledarray/issues/47/labels{/name}","comments_url":"https://api.github.com/repos/ValeevGroup/tiledarray/issues/47/comments","events_url":"https://api.github.com/repos/ValeevGroup/tiledarray/issues/47/events","html_url":"https://github.com/ValeevGroup/tiledarray/issues/47","id":116663832,"number":47,"title":"does assignment operation on expression do deep copy?","user":{"login":"pchong90","id":3442099,"avatar_url":"https://avatars.githubusercontent.com/u/3442099?v=3","gravatar_id":"","url":"https://api.github.com/users/pchong90","html_url":"https://github.com/pchong90","followers_url":"https://api.github.com/users/pchong90/followers","following_url":"https://api.github.com/users/pchong90/following{/other_user}","gists_url":"https://api.github.com/users/pchong90/gists{/gist_id}","starred_url":"https://api.github.com/users/pchong90/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pchong90/subscriptions","organizations_url":"https://api.github.com/users/pchong90/orgs","repos_url":"https://api.github.com/users/pchong90/repos","events_url":"https://api.github.com/users/pchong90/events{/privacy}","received_events_url":"https://api.github.com/users/pchong90/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-11-12T23:16:41Z","updated_at":"2015-11-12T23:16:41Z","closed_at":null,"body":"```\r\nt2(\"a,b,i,j\") = g_abij(\"a,b,i,j\");\r\n```\r\nAfter I update t2, g_abij is also updated. So, it this a bug? Or, is there another way to do deep copy?"}}