http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59701
Bug ID: 59701
Summary: A variadic alias template aliasing another variadic
alias template doesn't work
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ville.voutilainen at gmail dot com
template<typename... Args> struct foo { };
template<typename T, typename... Args> using bar = foo<T, Args...>;
template<typename T, typename... Args> using baz = bar<Args..., T>;
int
main (int argc, char *argv[])
{
}
This gives
edoceo7.cpp: In substitution of ‘template<class T, class ... Args> using bar =
foo<T, Args ...> [with T = Args ...; Args = {<expression error>}]’:
edoceo7.cpp:3:66: required from here
edoceo7.cpp:2:67: error: template argument 2 is invalid
template<typename T, typename... Args> using bar = foo<T, Args...>;
^
Multiple clang versions accept the code. Some clang versions ICE on it, but
that's another matter. :)
