https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112775
Bug ID: 112775
Summary: Class template partial specialization with decltype(n)
is wrongly rejected
Product: gcc
Version: 13.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: fchelnokov at gmail dot com
Target Milestone: ---
In this program
template <class T, T, T>
class A;
template <auto n>
class A<decltype(n), n, n> {};
class template A has one type parameter T, and two arbitrary non-type
parameters (of type T). And also a specialization of A is provided, having
equal non-type template parameters.
The program is accepted by Clang and MSVC, but not by GCC:
error: partial specialization 'class A<decltype (n), n, n>' is not more
specialized than
5 | class A<decltype(n), n, n> {};
| ^~~~~~~~~~~~~~~~~~~~
note: primary template 'template<class T, T <anonymous>, T <anonymous> > class
A'
Online demo: https://godbolt.org/z/qjYMn8bd6
