{"action":"created","comment":{"url":"https://api.github.com/repos/JuliaLang/julia/pulls/comments/27483521","id":27483521,"diff_hunk":"@@ -471,6 +472,37 @@ static jl_value_t *intersect_tuple(jl_tuple_t *a, jl_tuple_t *b,\n         }\n         jl_tupleset(tc, ci, ce);\n     }\n+    // Check for a length-constrained vararg\n+    if (bseq) {\n+        if (!jl_is_long(bn))\n+            // set bn from eqc parameters\n+            for (i = 0; i < eqc->n; i+=2)\n+                if (eqc->data[i] == bn) {\n+                    bn = eqc->data[i+1];\n+                    break;\n+                }\n+        if (jl_is_long(bn)) {\n+            long valen = jl_unbox_long(bn);\n+            if (valen != (ai-bi+1))\n+                result = (jl_value_t*)jl_bottom_type;\n+        }\n+        else if (jl_is_typevar(bn) && ((jl_tvar_t*)bn)->bound) {\n+            // set eqc parameter from valen, to support func{N}(x...N)\n+            int found = 0;\n+            long valen = ai-bi+1;\n+            for (i = 0; i < eqc->n; i+=2)\n+                if (eqc->data[i] == bn) {\n+                    eqc->data[i+1] = jl_box_long(valen);","path":"src/jltypes.c","position":43,"original_position":43,"commit_id":"1fb3c91f6956f0bed68995f259df96625e570788","original_commit_id":"1fb3c91f6956f0bed68995f259df96625e570788","user":{"login":"JeffBezanson","id":744556,"avatar_url":"https://avatars.githubusercontent.com/u/744556?v=3","gravatar_id":"","url":"https://api.github.com/users/JeffBezanson","html_url":"https://github.com/JeffBezanson","followers_url":"https://api.github.com/users/JeffBezanson/followers","following_url":"https://api.github.com/users/JeffBezanson/following{/other_user}","gists_url":"https://api.github.com/users/JeffBezanson/gists{/gist_id}","starred_url":"https://api.github.com/users/JeffBezanson/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/JeffBezanson/subscriptions","organizations_url":"https://api.github.com/users/JeffBezanson/orgs","repos_url":"https://api.github.com/users/JeffBezanson/repos","events_url":"https://api.github.com/users/JeffBezanson/events{/privacy}","received_events_url":"https://api.github.com/users/JeffBezanson/received_events","type":"User","site_admin":false},"body":"I'm not sure it's ok to overwrite the existing value here. Probably best to just call `extend`.","created_at":"2015-03-31T14:27:15Z","updated_at":"2015-03-31T14:27:15Z","html_url":"https://github.com/JuliaLang/julia/pull/10691#discussion_r27483521","pull_request_url":"https://api.github.com/repos/JuliaLang/julia/pulls/10691","_links":{"self":{"href":"https://api.github.com/repos/JuliaLang/julia/pulls/comments/27483521"},"html":{"href":"https://github.com/JuliaLang/julia/pull/10691#discussion_r27483521"},"pull_request":{"href":"https://api.github.com/repos/JuliaLang/julia/pulls/10691"}}},"pull_request":{"url":"https://api.github.com/repos/JuliaLang/julia/pulls/10691","id":32321220,"html_url":"https://github.com/JuliaLang/julia/pull/10691","diff_url":"https://github.com/JuliaLang/julia/pull/10691.diff","patch_url":"https://github.com/JuliaLang/julia/pull/10691.patch","issue_url":"https://api.github.com/repos/JuliaLang/julia/issues/10691","number":10691,"state":"open","locked":false,"title":"RFC: controlling dispatch with varargs of defined length","user":{"login":"timholy","id":1525481,"avatar_url":"https://avatars.githubusercontent.com/u/1525481?v=3","gravatar_id":"","url":"https://api.github.com/users/timholy","html_url":"https://github.com/timholy","followers_url":"https://api.github.com/users/timholy/followers","following_url":"https://api.github.com/users/timholy/following{/other_user}","gists_url":"https://api.github.com/users/timholy/gists{/gist_id}","starred_url":"https://api.github.com/users/timholy/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/timholy/subscriptions","organizations_url":"https://api.github.com/users/timholy/orgs","repos_url":"https://api.github.com/users/timholy/repos","events_url":"https://api.github.com/users/timholy/events{/privacy}","received_events_url":"https://api.github.com/users/timholy/received_events","type":"User","site_admin":false},"body":"This implements the syntax `x...N` to specify a varargs argument of length `N`. The purpose is to be able to control dispatch to functions like\r\n```julia\r\nfunction getindex{T,N}(A::AbstractArray{T,N}, indexes...N)\r\n...\r\nend\r\n```\r\nso that this method only gets called when the number of `indexes` matches the dimensionality of the array. This is motivated by #10525.\r\n\r\nIncidentally, this adds a number of comments to \"core\" code, particularly 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