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From: "turtlefight at ymail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/103672] New: using with template<template<class...> class> causes internal compiler error Date: Sun, 12 Dec 2021 18:51:49 +0000 [thread overview] Message-ID: <bug-103672-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103672 Bug ID: 103672 Summary: using with template<template<class...> class> causes internal compiler error Product: gcc Version: 11.2.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: turtlefight at ymail dot com Target Milestone: --- The following example results in an internal compiler error. It does compile fine with clang and msvc. Example Code: #include <functional> #include <memory> template<class T> struct unique { auto operator()(auto&&... args) { return std::make_unique<T>(std::forward<decltype(args)>(args)...); } }; template<template<class...> class T, class... Args> using deduced_type = decltype(T{std::declval<Args>()...}); template<template<class> class F, template<class...> class T, class... Args> auto make(Args&&... args) { return F<deduced_type<T, Args...>>{}(std::forward<Args>(args)...); } template<class A, class B> struct Foo { Foo(A,B) {} }; int main(){ auto foo_unique = make<unique, Foo>(1, 2); } Full Error Message: <source>: In instantiation of 'auto make(Args&& ...) [with F = unique; T = Foo; Args = {int, int}]': <source>:24:40: required from here <source>:16:41: internal compiler error: in tsubst, at cp/pt.c:15632 16 | return F<deduced_type<T, Args...>>{}(std::forward<Args>(args)...); | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 0x21004e9 internal_error(char const*, ...) ???:0 0x7e96eb fancy_abort(char const*, int, char const*) ???:0 0xa5fde7 tsubst(tree_node*, tree_node*, int, tree_node*) ???:0 0xa5d3af tsubst(tree_node*, tree_node*, int, tree_node*) ???:0 0xa89b76 tsubst_template_args(tree_node*, tree_node*, int, tree_node*) ???:0 0xa5d954 tsubst(tree_node*, tree_node*, int, tree_node*) ???:0 0xa5eb8d tsubst(tree_node*, tree_node*, int, tree_node*) ???:0 0xa63a47 instantiate_decl(tree_node*, bool, bool) ???:0 0x904ebe maybe_instantiate_decl(tree_node*) ???:0 0x906980 mark_used(tree_node*, int) ???:0 0x819197 build_new_function_call(tree_node*, vec<tree_node*, va_gc, vl_embed>**, int) ???:0 0xaca89c finish_call_expr(tree_node*, vec<tree_node*, va_gc, vl_embed>**, bool, bool, int) ???:0 0xa29b8d c_parse_file() ???:0 0xbb6bb2 c_common_parse_file() ???:0 Godbolt Example: https://godbolt.org/z/rd4PdYrq8 What's interesting is that the code compiles without problems if a using declaration is not used, e.g.: template<template<class> class F, template<class...> class T, class... Args> auto make(Args&&... args) { return F<decltype(T{std::declval<Args>()...})>{}(std::forward<Args>(args)...); } Godbolt Example: https://godbolt.org/z/Pd3Mjs8rG
next reply other threads:[~2021-12-12 18:51 UTC|newest] Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-12-12 18:51 turtlefight at ymail dot com [this message] 2021-12-13 11:59 ` [Bug c++/103672] [10/11/12 Regression] " redi at gcc dot gnu.org 2022-01-04 9:47 ` rguenth at gcc dot gnu.org 2022-01-13 15:28 ` ppalka at gcc dot gnu.org 2022-01-20 14:26 ` cvs-commit at gcc dot gnu.org 2022-01-20 14:30 ` [Bug c++/103672] [10/11 " ppalka at gcc dot gnu.org 2022-05-11 17:48 ` ppalka at gcc dot gnu.org 2022-06-28 10:47 ` jakub at gcc dot gnu.org 2023-05-21 15:12 ` ppalka at gcc dot gnu.org
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