{"action":"created","comment":{"url":"https://api.github.com/repos/JuliaLang/julia/pulls/comments/80950602","pull_request_review_id":1967259,"id":80950602,"diff_hunk":"@@ -1028,12 +1037,40 @@ copy them*, for the following reasons:\n * the ``foo`` function has side-effects, and it is undefined exactly when,\n   how often or how many times these side-effects will occur\n * the ``bar`` function solves a problem that is better solved with multiple\n-  dispatch - defining ``bar(x) = x`` and ``bar(x::Integer) = x^2`` will do\n+  dispatch - defining ``bar(x) = x`` and ``bar(x::Integer) = x ^ 2`` will do\n   the same thing, but it is both simpler and faster.\n * the ``baz`` function is pathologically insane\n \n-Instead, now that we have a better understanding for how generated functions\n-work, let's use them to build some more advanced functionality...\n+Note that the set of operations that should not be attempted in a generated function\n+is unbounded, and the runtime system can currently only detect a subset of\n+the invalid operations. There are many other operations that will simply\n+corrupt the runtime system without notification, usually in subtle\n+ways not obviously connected to the bad definition.\n+Because the function generator is run during inference,\n+it must respect all of the limitations of that code.\n+\n+Some operations that should not be attempted include:\n+\n+  1. Caching of native pointers.\n+\n+  2. Interacting with the contents or methods of Core.Inference in any way.\n+\n+  3. Observing any mutable state.\n+\n+     - Inference on the generated function may be run at *any* time,\n+       including while your code is attempting to observe or mutate this state.\n+\n+  4. Taking any locks: C code you call out to may use locks internally,\n+     (for example, it is not problematic to call ``malloc``,\n+     even though most implementations require locks internally)\n+     but don't attempt to hold or acquire any while executing Julia code.\n+\n+  5. Calling any function that is defined after the body of the generated function.\n+     This condition is relaxed for incrementally-loaded precompiled modules to\n+     allow calling any function in the module.\n+\n+Alright, now that we have a better understanding for how generated functions","path":"doc/manual/metaprogramming.rst","position":182,"original_position":182,"commit_id":"3f2213f4e74ed3070045da139f659694b7c071a8","original_commit_id":"3f2213f4e74ed3070045da139f659694b7c071a8","user":{"login":"Sacha0","id":5799177,"avatar_url":"https://avatars.githubusercontent.com/u/5799177?v=3","gravatar_id":"","url":"https://api.github.com/users/Sacha0","html_url":"https://github.com/Sacha0","followers_url":"https://api.github.com/users/Sacha0/followers","following_url":"https://api.github.com/users/Sacha0/following{/other_user}","gists_url":"https://api.github.com/users/Sacha0/gists{/gist_id}","starred_url":"https://api.github.com/users/Sacha0/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Sacha0/subscriptions","organizations_url":"https://api.github.com/users/Sacha0/orgs","repos_url":"https://api.github.com/users/Sacha0/repos","events_url":"https://api.github.com/users/Sacha0/events{/privacy}","received_events_url":"https://api.github.com/users/Sacha0/received_events","type":"User","site_admin":false},"body":"for -> of (\"now that we have a better understanding of how generated functions work\").","created_at":"2016-09-28T15:49:12Z","updated_at":"2016-09-28T15:49:12Z","html_url":"https://github.com/JuliaLang/julia/pull/18679#discussion_r80950602","pull_request_url":"https://api.github.com/repos/JuliaLang/julia/pulls/18679","_links":{"self":{"href":"https://api.github.com/repos/JuliaLang/julia/pulls/comments/80950602"},"html":{"href":"https://github.com/JuliaLang/julia/pull/18679#discussion_r80950602"},"pull_request":{"href":"https://api.github.com/repos/JuliaLang/julia/pulls/18679"}}},"pull_request":{"url":"https://api.github.com/repos/JuliaLang/julia/pulls/18679","id":86808216,"html_url":"https://github.com/JuliaLang/julia/pull/18679","diff_url":"https://github.com/JuliaLang/julia/pull/18679.diff","patch_url":"https://github.com/JuliaLang/julia/pull/18679.patch","issue_url":"https://api.github.com/repos/JuliaLang/julia/issues/18679","number":18679,"state":"open","locked":false,"title":"backport of changes in #17057 that don't require new worlds","user":{"login":"vtjnash","id":330950,"avatar_url":"https://avatars.githubusercontent.com/u/330950?v=3","gravatar_id":"","url":"https://api.github.com/users/vtjnash","html_url":"https://github.com/vtjnash","followers_url":"https://api.github.com/users/vtjnash/followers","following_url":"https://api.github.com/users/vtjnash/following{/other_user}","gists_url":"https://api.github.com/users/vtjnash/gists{/gist_id}","starred_url":"https://api.github.com/users/vtjnash/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/vtjnash/subscriptions","organizations_url":"https://api.github.com/users/vtjnash/orgs","repos_url":"https://api.github.com/users/vtjnash/repos","events_url":"https://api.github.com/users/vtjnash/events{/privacy}","received_events_url":"https://api.github.com/users/vtjnash/received_events","type":"User","site_admin":false},"body":"Fixes some method definition orderings, and other `@generated` functions, that will be broken by PR #17057","created_at":"2016-09-26T19:59:07Z","updated_at":"2016-09-28T15:49:12Z","closed_at":null,"merged_at":null,"merge_commit_sha":"ff3ca2fe6d6d07f8ee14a2bd088a48c35f67f301","assignee":null,"assignees":[],"milestone":null,"commits_url":"https://api.github.com/repos/JuliaLang/julia/pulls/18679/commits","review_comments_url":"https://api.github.com/repos/JuliaLang/julia/pulls/18679/comments","review_comment_url":"https://api.github.com/repos/JuliaLang/julia/pulls/comments{/number}","comments_url":"https://api.github.com/repos/JuliaLang/julia/issues/18679/comments","statuses_url":"https://api.github.com/repos/JuliaLang/julia/statuses/3f2213f4e74ed3070045da139f659694b7c071a8","head":{"label":"JuliaLang:jn/backports265.1","ref":"jn/backports265.1","sha":"3f2213f4e74ed3070045da139f659694b7c071a8","user":{"login":"JuliaLang","id":743164,"avatar_url":"https://avatars.githubusercontent.com/u/743164?v=3","gravatar_id":"","url":"https://api.github.com/users/JuliaLang","html_url":"https://github.com/JuliaLang","followers_url":"https://api.github.com/users/JuliaLang/followers","following_url":"https://api.github.com/users/JuliaLang/following{/other_user}","gists_url":"https://api.github.com/users/JuliaLang/gists{/gist_id}","starred_url":"https://api.github.com/users/JuliaLang/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/JuliaLang/subscriptions","organizations_url":"https://api.github.com/users/JuliaLang/orgs","repos_url":"https://api.github.com/users/JuliaLang/repos","events_url":"https://api.github.com/users/JuliaLang/events{/privacy}","received_events_url":"https://api.github.com/users/JuliaLang/received_events","type":"Organization","site_admin":false},"repo":{"id":1644196,"name":"julia","full_name":"JuliaLang/julia","owner":{"login":"JuliaLang","id":743164,"avatar_url":"https://avatars.githubusercontent.com/u/743164?v=3","gravatar_id":"","url":"https://api.github.com/users/JuliaLang","html_url":"https://github.com/JuliaLang","followers_url":"https://api.github.com/users/JuliaLang/followers","following_url":"https://api.github.com/users/JuliaLang/following{/other_user}","gists_url":"https://api.github.com/users/JuliaLang/gists{/gist_id}","starred_url":"https://api.github.com/users/JuliaLang/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/JuliaLang/subscriptions","organizations_url":"https://api.github.com/users/JuliaLang/orgs","repos_url":"https://api.github.com/users/JuliaLang/repos","events_url":"https://api.github.com/users/JuliaLang/events{/privacy}","received_events_url":"https://api.github.com/users/JuliaLang/received_events","type":"Organization","site_admin":false},"private":false,"html_url":"https://github.com/JuliaLang/julia","description":"The Julia Language: A fresh approach to technical computing.","fork":false,"url":"https://api.github.com/repos/JuliaLang/julia","forks_url":"https://api.github.com/repos/JuliaLang/julia/forks","keys_url":"https://api.github.com/repos/JuliaLang/julia/keys{/key_id}","collaborators_url":"https://api.github.com/repos/JuliaLang/julia/collaborators{/collaborator}","teams_url":"https://api.github.com/repos/JuliaLang/julia/teams","hooks_url":"https://api.github.com/repos/JuliaLang/julia/hooks","issue_events_url":"https://api.github.com/repos/JuliaLang/julia/issues/events{/number}","events_url":"https://api.github.com/repos/JuliaLang/julia/events","assignees_url":"https://api.github.com/repos/JuliaLang/julia/assignees{/user}","branches_url":"https://api.github.com/repos/JuliaLang/julia/branches{/branch}","tags_url":"https://api.github.com/repos/JuliaLang/julia/tags","blobs_url":"https://api.github.com/repos/JuliaLang/julia/git/blobs{/sha}","git_tags_url":"https://api.github.com/repos/JuliaLang/julia/git/tags{/sha}","git_refs_url":"https://api.github.com/repos/JuliaLang/julia/git/refs{/sha}","trees_url":"https://api.github.com/repos/JuliaLang/julia/git/trees{/sha}","statuses_url":"https://api.github.com/repos/JuliaLang/julia/statuses/{sha}","languages_url":"https://api.github.com/repos/JuliaLang/julia/languages","stargazers_url":"https://api.github.com/repos/JuliaLang/julia/stargazers","contributors_url":"https://api.github.com/repos/JuliaLang/julia/contributors","subscribers_url":"https://api.github.com/repos/JuliaLang/julia/subscribers","subscription_url":"https://api.github.com/repos/JuliaLang/julia/subscription","commits_url":"https://api.github.com/repos/JuliaLang/julia/commits{/sha}","git_commits_url":"https://api.github.com/repos/JuliaLang/julia/git/commits{/sha}","comments_url":"https://api.github.com/repos/JuliaLang/julia/comments{/number}","issue_comment_url":"https://api.github.com/repos/JuliaLang/julia/issues/comments{/number}","contents_url":"https://api.github.com/repos/JuliaLang/julia/contents/{+path}","compare_url":"https://api.github.com/repos/JuliaLang/julia/compare/{base}...{head}","merges_url":"https://api.github.com/repos/JuliaLang/julia/merges","archive_url":"https://api.github.com/repos/JuliaLang/julia/{archive_format}{/ref}","downloads_url":"https://api.github.com/repos/JuliaLang/julia/downloads","issues_url":"https://api.github.com/repos/JuliaLang/julia/issues{/number}","pulls_url":"https://api.github.com/repos/JuliaLang/julia/pulls{/number}","milestones_url":"https://api.github.com/repos/JuliaLang/julia/milestones{/number}","notifications_url":"https://api.github.com/repos/JuliaLang/julia/notifications{?since,all,participating}","labels_url":"https://api.github.com/repos/JuliaLang/julia/labels{/name}","releases_url":"https://api.github.com/repos/JuliaLang/julia/releases{/id}","deployments_url":"https://api.github.com/repos/JuliaLang/julia/deployments","created_at":"2011-04-21T07:01:50Z","updated_at":"2016-09-28T13:46:35Z","pushed_at":"2016-09-28T15:21:20Z","git_url":"git://github.com/JuliaLang/julia.git","ssh_url":"git@github.com:JuliaLang/julia.git","clone_url":"https://github.com/JuliaLang/julia.git","svn_url":"https://github.com/JuliaLang/julia","homepage":"http://julialang.org/","size":423623,"stargazers_count":7604,"watchers_count":7604,"language":"Julia","has_issues":true,"has_downloads":true,"has_wiki":false,"has_pages":false,"forks_count":1779,"mirror_url":null,"open_issues_count":2013,"forks":1779,"open_issues":2013,"watchers":7604,"default_branch":"master"}},"base":{"label":"JuliaLang:master","ref":"master","sha":"c71f205f9341272438de802e2003ff375a32d83c","user":{"login":"JuliaLang","id":743164,"avatar_url":"https://avatars.githubusercontent.com/u/743164?v=3","gravatar_id":"","url":"https://api.github.com/users/JuliaLang","html_url":"https://github.com/JuliaLang","followers_url":"https://api.github.com/users/JuliaLang/followers","following_url":"https://api.github.com/users/JuliaLang/following{/other_user}","gists_url":"https://api.github.com/users/JuliaLang/gists{/gist_id}","starred_url":"https://api.github.com/users/JuliaLang/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/JuliaLang/subscriptions","organizations_url":"https://api.github.com/users/JuliaLang/orgs","repos_url":"https://api.github.com/users/JuliaLang/repos","events_url":"https://api.github.com/users/JuliaLang/events{/privacy}","received_events_url":"https://api.github.com/users/JuliaLang/received_events","type":"Organization","site_admin":false},"repo":{"id":1644196,"name":"julia","full_name":"JuliaLang/julia","owner":{"login":"JuliaLang","id":743164,"avatar_url":"https://avatars.githubusercontent.com/u/743164?v=3","gravatar_id":"","url":"https://api.github.com/users/JuliaLang","html_url":"https://github.com/JuliaLang","followers_url":"https://api.github.com/users/JuliaLang/followers","following_url":"https://api.github.com/users/JuliaLang/following{/other_user}","gists_url":"https://api.github.com/users/JuliaLang/gists{/gist_id}","starred_url":"https://api.github.com/users/JuliaLang/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/JuliaLang/subscriptions","organizations_url":"https://api.github.com/users/JuliaLang/orgs","repos_url":"https://api.github.com/users/JuliaLang/repos","events_url":"https://api.github.com/users/JuliaLang/events{/privacy}","received_events_url":"https://api.github.com/users/JuliaLang/received_events","type":"Organization","site_admin":false},"private":false,"html_url":"https://github.com/JuliaLang/julia","description":"The Julia Language: A fresh approach to technical computing.","fork":false,"url":"https://api.github.com/repos/JuliaLang/julia","forks_url":"https://api.github.com/repos/JuliaLang/julia/forks","keys_url":"https://api.github.com/repos/JuliaLang/julia/keys{/key_id}","collaborators_url":"https://api.github.com/repos/JuliaLang/julia/collaborators{/collaborator}","teams_url":"https://api.github.com/repos/JuliaLang/julia/teams","hooks_url":"https://api.github.com/repos/JuliaLang/julia/hooks","issue_events_url":"https://api.github.com/repos/JuliaLang/julia/issues/events{/number}","events_url":"https://api.github.com/repos/JuliaLang/julia/events","assignees_url":"https://api.github.com/repos/JuliaLang/julia/assignees{/user}","branches_url":"https://api.github.com/repos/JuliaLang/julia/branches{/branch}","tags_url":"https://api.github.com/repos/JuliaLang/julia/tags","blobs_url":"https://api.github.com/repos/JuliaLang/julia/git/blobs{/sha}","git_tags_url":"https://api.github.com/repos/JuliaLang/julia/git/tags{/sha}","git_refs_url":"https://api.github.com/repos/JuliaLang/julia/git/refs{/sha}","trees_url":"https://api.github.com/repos/JuliaLang/julia/git/trees{/sha}","statuses_url":"https://api.github.com/repos/JuliaLang/julia/statuses/{sha}","languages_url":"https://api.github.com/repos/JuliaLang/julia/languages","stargazers_url":"https://api.github.com/repos/JuliaLang/julia/stargazers","contributors_url":"https://api.github.com/repos/JuliaLang/julia/contributors","subscribers_url":"https://api.github.com/repos/JuliaLang/julia/subscribers","subscription_url":"https://api.github.com/repos/JuliaLang/julia/subscription","commits_url":"https://api.github.com/repos/JuliaLang/julia/commits{/sha}","git_commits_url":"https://api.github.com/repos/JuliaLang/julia/git/commits{/sha}","comments_url":"https://api.github.com/repos/JuliaLang/julia/comments{/number}","issue_comment_url":"https://api.github.com/repos/JuliaLang/julia/issues/comments{/number}","contents_url":"https://api.github.com/repos/JuliaLang/julia/contents/{+path}","compare_url":"https://api.github.com/repos/JuliaLang/julia/compare/{base}...{head}","merges_url":"https://api.github.com/repos/JuliaLang/julia/merges","archive_url":"https://api.github.com/repos/JuliaLang/julia/{archive_format}{/ref}","downloads_url":"https://api.github.com/repos/JuliaLang/julia/downloads","issues_url":"https://api.github.com/repos/JuliaLang/julia/issues{/number}","pulls_url":"https://api.github.com/repos/JuliaLang/julia/pulls{/number}","milestones_url":"https://api.github.com/repos/JuliaLang/julia/milestones{/number}","notifications_url":"https://api.github.com/repos/JuliaLang/julia/notifications{?since,all,participating}","labels_url":"https://api.github.com/repos/JuliaLang/julia/labels{/name}","releases_url":"https://api.github.com/repos/JuliaLang/julia/releases{/id}","deployments_url":"https://api.github.com/repos/JuliaLang/julia/deployments","created_at":"2011-04-21T07:01:50Z","updated_at":"2016-09-28T13:46:35Z","pushed_at":"2016-09-28T15:21:20Z","git_url":"git://github.com/JuliaLang/julia.git","ssh_url":"git@github.com:JuliaLang/julia.git","clone_url":"https://github.com/JuliaLang/julia.git","svn_url":"https://github.com/JuliaLang/julia","homepage":"http://julialang.org/","size":423623,"stargazers_count":7604,"watchers_count":7604,"language":"Julia","has_issues":true,"has_downloads":true,"has_wiki":false,"has_pages":false,"forks_count":1779,"mirror_url":null,"open_issues_count":2013,"forks":1779,"open_issues":2013,"watchers":7604,"default_branch":"master"}},"_links":{"self":{"href":"https://api.github.com/repos/JuliaLang/julia/pulls/18679"},"html":{"href":"https://github.com/JuliaLang/julia/pull/18679"},"issue":{"href":"https://api.github.com/repos/JuliaLang/julia/issues/18679"},"comments":{"href":"https://api.github.com/repos/JuliaLang/julia/issues/18679/comments"},"review_comments":{"href":"https://api.github.com/repos/JuliaLang/julia/pulls/18679/comments"},"review_comment":{"href":"https://api.github.com/repos/JuliaLang/julia/pulls/comments{/number}"},"commits":{"href":"https://api.github.com/repos/JuliaLang/julia/pulls/18679/commits"},"statuses":{"href":"https://api.github.com/repos/JuliaLang/julia/statuses/3f2213f4e74ed3070045da139f659694b7c071a8"}}}}
{"actor":{"display_login":"Sacha0"}}