[llvm-bugs] [Bug 43076] New: template <auto> doesn't work with partial specialization

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43076

            Bug ID: 43076
           Summary: template <auto> doesn't work with partial
                    specialization
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++17
          Assignee: unassignedclangbugs at nondot.org
          Reporter: barry.revzin at gmail.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

Example:

template <auto> struct foo { static constexpr int value = 0; };
template <int I> struct foo<I> { static constexpr int value = 1; };

static_assert(foo<42L>::value == 0);

According to clang, foo<42L>::value is 1, but the partial specialization should
not match here (we fail [temp.deduct.type]/19 because the type of 42L differs
from the type of the parameter).

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