[llvm-bugs] [Bug 47841] New: Template argument deduction not allowed in template parameter

Wed, 14 Oct 2020 05:15:02 -0700 

https://bugs.llvm.org/show_bug.cgi?id=47841

            Bug ID: 47841
           Summary: Template argument deduction not allowed in template
                    parameter
           Product: clang
           Version: 11.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++2a
          Assignee: unassignedclangb...@nondot.org
          Reporter: dudkindanii...@yandex.ru
                CC: blitzrak...@gmail.com, erik.pilking...@gmail.com,
                    llvm-bugs@lists.llvm.org, richard-l...@metafoo.co.uk

https://godbolt.org/z/W8s74M

#include <array>

template <std::array Arr>
struct Foo {
};


<source>:3:11: error: use of class template 'array' requires template
arguments; argument deduction not allowed in template parameter

template <std::array Arr>

          ^~~

But latest C++20 draft says otherwise [temp.arg.nontype.1]:
http://eel.is/c++draft/temp.arg.nontype#1

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