{"action":"created","comment":{"url":"https://api.github.com/repos/JuliaLang/julia/pulls/comments/63062018","id":63062018,"diff_hunk":"@@ -1011,14 +1015,32 @@ JL_DLLEXPORT jl_datatype_t *jl_new_bitstype(jl_value_t *name, jl_datatype_t *sup\n \n // type constructor -----------------------------------------------------------\n \n-jl_typector_t *jl_new_type_ctor(jl_svec_t *params, jl_value_t *body)\n+JL_DLLEXPORT jl_value_t *jl_new_type_constructor(jl_svec_t *p, jl_value_t *body)\n {\n-    jl_typector_t *tc = (jl_typector_t*)newobj((jl_value_t*)jl_typector_type,NWORDS(sizeof(jl_typector_t)));\n+    size_t i, np = jl_svec_len(p);\n+    jl_value_t **env;\n+    JL_GC_PUSHARGS(env, np * 2 + 2);\n+    jl_svec_t *params = jl_alloc_svec(np);\n+    env[np * 2] = (jl_value_t*)params;\n+    for (i = 0; i < np; i++) {\n+        // recreate body with the TypeVar unbound\n+        jl_tvar_t *tv = (jl_tvar_t*)jl_svecref(p, i);\n+        assert(jl_is_typevar(tv));\n+        env[2 * i] = (jl_value_t*)tv;\n+        tv = jl_new_typevar(tv->name, tv->lb, tv->ub);","path":"src/alloc.c","position":36,"original_position":36,"commit_id":"1774e29fd3ca6da4b5a3ab8f34d02560b4cb3e15","original_commit_id":"1774e29fd3ca6da4b5a3ab8f34d02560b4cb3e15","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":"why would I make a TypeVar with a ub of NULL? Why hasn't the frontend always been doing that instead of requiring the backend to mutate them?","created_at":"2016-05-12T17:29:41Z","updated_at":"2016-05-12T17:29:41Z","html_url":"https://github.com/JuliaLang/julia/pull/16320#discussion_r63062018","pull_request_url":"https://api.github.com/repos/JuliaLang/julia/pulls/16320","_links":{"self":{"href":"https://api.github.com/repos/JuliaLang/julia/pulls/comments/63062018"},"html":{"href":"https://github.com/JuliaLang/julia/pull/16320#discussion_r63062018"},"pull_request":{"href":"https://api.github.com/repos/JuliaLang/julia/pulls/16320"}}},"pull_request":{"url":"https://api.github.com/repos/JuliaLang/julia/pulls/16320","id":69755461,"html_url":"https://github.com/JuliaLang/julia/pull/16320","diff_url":"https://github.com/JuliaLang/julia/pull/16320.diff","patch_url":"https://github.com/JuliaLang/julia/pull/16320.patch","issue_url":"https://api.github.com/repos/JuliaLang/julia/issues/16320","number":16320,"state":"open","locked":false,"title":"memoize more type properties","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":"type properties are accessed heavily by subtyping and intersection, so it's generally worthwhile to memoize them upon construction.\r\n\r\n@carnaval I think you had separately observed this during profiling? Currently, I've also left in the old code paths and use it verify that the cached value is correct when using a debug 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