{"action":"opened","issue":{"url":"https://api.github.com/repos/mruby/mruby/issues/2735","labels_url":"https://api.github.com/repos/mruby/mruby/issues/2735/labels{/name}","comments_url":"https://api.github.com/repos/mruby/mruby/issues/2735/comments","events_url":"https://api.github.com/repos/mruby/mruby/issues/2735/events","html_url":"https://github.com/mruby/mruby/issues/2735","id":59028520,"number":2735,"title":"What are “special” variables?","user":{"login":"cremno","id":212792,"avatar_url":"https://avatars.githubusercontent.com/u/212792?v=3","gravatar_id":"","url":"https://api.github.com/users/cremno","html_url":"https://github.com/cremno","followers_url":"https://api.github.com/users/cremno/followers","following_url":"https://api.github.com/users/cremno/following{/other_user}","gists_url":"https://api.github.com/users/cremno/gists{/gist_id}","starred_url":"https://api.github.com/users/cremno/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/cremno/subscriptions","organizations_url":"https://api.github.com/users/cremno/orgs","repos_url":"https://api.github.com/users/cremno/repos","events_url":"https://api.github.com/users/cremno/events{/privacy}","received_events_url":"https://api.github.com/users/cremno/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-02-26T06:48:46Z","updated_at":"2015-02-26T06:48:46Z","closed_at":null,"body":"https://github.com/mruby/mruby/blob/a1d4992187146f99cc81045e6757f2b146f49193/src/vm.c#L840-L851\r\n```c\r\n    CASE(OP_GETSPECIAL) {\r\n      /* A Bx   R(A) := Special[Bx] */\r\n      regs[GETARG_A(i)] = mrb_vm_special_get(mrb, GETARG_Bx(i));\r\n      NEXT;\r\n    }\r\n\r\n    CASE(OP_SETSPECIAL) {\r\n      /* A Bx   Special[Bx] := R(A) */\r\n      mrb_vm_special_set(mrb, GETARG_Bx(i), regs[GETARG_A(i)]);\r\n      NEXT;\r\n    }\r\n\r\n```\r\n\r\nI'm curious what they were supposed to do."}}