{"action":"created","comment":{"url":"https://api.github.com/repos/JuliaLang/julia/pulls/comments/78425126","id":78425126,"diff_hunk":"@@ -4558,3 +4558,15 @@ function f18173()\n     successflag = false\n end\n @test f18173() == false\n+\n+let _true = Ref(true), f, g, h\n+    @noinline f() = ccall((:error, :error), Void, ()) # some expression that throws an error in codegen","path":"test/core.jl","position":28,"original_position":28,"commit_id":"1b22b61f3024b4187c7d58d4a335bbd29c96e139","original_commit_id":"1b22b61f3024b4187c7d58d4a335bbd29c96e139","user":{"login":"tkelman","id":5934628,"avatar_url":"https://avatars.githubusercontent.com/u/5934628?v=3","gravatar_id":"","url":"https://api.github.com/users/tkelman","html_url":"https://github.com/tkelman","followers_url":"https://api.github.com/users/tkelman/followers","following_url":"https://api.github.com/users/tkelman/following{/other_user}","gists_url":"https://api.github.com/users/tkelman/gists{/gist_id}","starred_url":"https://api.github.com/users/tkelman/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/tkelman/subscriptions","organizations_url":"https://api.github.com/users/tkelman/orgs","repos_url":"https://api.github.com/users/tkelman/repos","events_url":"https://api.github.com/users/tkelman/events{/privacy}","received_events_url":"https://api.github.com/users/tkelman/received_events","type":"User","site_admin":false},"body":"isn't this fragile if someone happens to have an `error.so` somewhere on their library path?","created_at":"2016-09-12T18:14:14Z","updated_at":"2016-09-12T18:14:14Z","html_url":"https://github.com/JuliaLang/julia/pull/18413#discussion_r78425126","pull_request_url":"https://api.github.com/repos/JuliaLang/julia/pulls/18413","_links":{"self":{"href":"https://api.github.com/repos/JuliaLang/julia/pulls/comments/78425126"},"html":{"href":"https://github.com/JuliaLang/julia/pull/18413#discussion_r78425126"},"pull_request":{"href":"https://api.github.com/repos/JuliaLang/julia/pulls/18413"}}},"pull_request":{"url":"https://api.github.com/repos/JuliaLang/julia/pulls/18413","id":84524276,"html_url":"https://github.com/JuliaLang/julia/pull/18413","diff_url":"https://github.com/JuliaLang/julia/pull/18413.diff","patch_url":"https://github.com/JuliaLang/julia/pull/18413.patch","issue_url":"https://api.github.com/repos/JuliaLang/julia/issues/18413","number":18413,"state":"open","locked":false,"title":"split SourceInfo out of LambdaInfo","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":"A number of recent changes to the system subtly broke the definition of LambdaInfo (most recently culminating in https://github.com/JuliaLang/julia/pull/18191), this aims to rectify that shift in identity by revising the way this data is passed around the system. And I expect this to be useful for fix #265, since the current issue I'm running into there is the possibility the system will try to duplicate an existing LambdaInfo (for example to re-infer it: https://github.com/JuliaLang/julia/blob/424b3c5a47d0005da83407c2115be80df70f02ef/base/inference.jl#L1601-L1621) which made it difficult to track them and somewhat impossible to accurately invalidate them.\r\n\r\nMajor changes:\r\n - several functions no longer have \"update their cache\" as a goal. instead they return a value (they do still transparently maintain a cache, but that's now an implementation detail). most significantly, these include: jl_type_infer / typeinf_ext, jl_compile_for_dispatch / jl_compile_linfo, and jl_generate_fptr\r\n - type-inference now returns a SourceInfo tree (which may *or may not* be cached in the LambdaInfo that was passed in), allowing better (earlier) code deletion in some cases and easier thread-safety (less race-y to look at the code field)\r\n - the `code` field of LambdaInfo is gone, replaced by `inferred` and which is usually `null`. This fixes two of the lock priority inversion bugs, as now no Julia code needs to get run to create a LambdaInfo. And it should make it easier to delete the code (as that's a return to the default state rather than the presence of a third rare state), so that's done more aggressively now.\r\n - `jlcall_api` has been incremented by 1 to make it thread-safe to read without needing a lock or atomics ops in the fast-path of jl_call_method_internal (except `jlcall_api = 2`, which remains unchanged)\r\n - printing of LambdaInfo (e.g. from `expand`, `code_lowered`, `code_typed`, etc.) is corrected / improved / fixed, since it is no longer ambiguous whether to print the source or the 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