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writing this:\r\n\r\n```r\r\nc <- call(\"fun\", quote(arg))\r\nnames(c)[2] <- \"n\"\r\nnames(c)\r\n#> [1] \"\"  \"n\"\r\n\r\nl <- list(1, 2)\r\nnames(l)[2] <- \"n\"\r\nnames(l)\r\n#> [1] NA  \"n\"\r\n```\r\n\r\nalso\r\n\r\n```r\r\nnames(c) <- c(NA, NA)\r\nnames(c)\r\n#> NULL\r\n\r\nnames(l) <- c(NA, NA)\r\nnames(l)\r\n#> [1] NA NA\r\n```","created_at":"2016-08-29T11:55:48Z","updated_at":"2016-08-29T11:55:48Z","closed_at":null,"merged_at":null,"merge_commit_sha":"027ab7435d1b20f42cb23572506b6a0a979b19da","assignee":null,"assignees":[],"milestone":null,"commits_url":"https://api.github.com/repos/hadley/dplyr/pulls/2097/commits","review_comments_url":"https://api.github.com/repos/hadley/dplyr/pulls/2097/comments","review_comment_url":"https://api.github.com/repos/hadley/dplyr/pulls/comments{/number}","comments_url":"https://api.github.com/repos/hadley/dplyr/issues/2097/comments","statuses_url":"https://api.github.com/repos/hadley/dplyr/statuses/1ea4841551c6f16e386b9b6645ba391d6a3ef501","head":{"label":"lionel-:funs-unnamed-args","ref":"funs-unnamed-args","sha":"1ea4841551c6f16e386b9b6645ba391d6a3ef501","user":{"login":"lionel-","id":4465050,"avatar_url":"https://avatars.githubusercontent.com/u/4465050?v=3","gravatar_id":"","url":"https://api.github.com/users/lionel-","html_url":"https://github.com/lionel-","followers_url":"https://api.github.com/users/lionel-/followers","following_url":"https://api.github.com/users/lionel-/following{/other_user}","gists_url":"https://api.github.com/users/lionel-/gists{/gist_id}","starred_url":"https://api.github.com/users/lionel-/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/lionel-/subscriptions","organizations_url":"https://api.github.com/users/lionel-/orgs","repos_url":"https://api.github.com/users/lionel-/repos","events_url":"https://api.github.com/users/lionel-/events{/privacy}","received_events_url":"https://api.github.com/users/lionel-/received_events","type":"User","site_admin":false},"repo":{"id":27480240,"name":"dplyr","full_name":"lionel-/dplyr","owner":{"login":"lionel-","id":4465050,"avatar_url":"https://avatars.githubusercontent.com/u/4465050?v=3","gravatar_id":"","url":"https://api.github.com/users/lionel-","html_url":"https://github.com/lionel-","followers_url":"https://api.github.com/users/lionel-/followers","following_url":"https://api.github.com/users/lionel-/following{/other_user}","gists_url":"https://api.github.com/users/lionel-/gists{/gist_id}","starred_url":"https://api.github.com/users/lionel-/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/lionel-/subscriptions","organizations_url":"https://api.github.com/users/lionel-/orgs","repos_url":"https://api.github.com/users/lionel-/repos","events_url":"https://api.github.com/users/lionel-/events{/privacy}","received_events_url":"https://api.github.com/users/lionel-/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/lionel-/dplyr","description":"Plyr 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