[llvm-bugs] [Bug 49709] New: clang parser crash for instantiating char array

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49709

            Bug ID: 49709
           Summary: clang parser crash for instantiating char array
           Product: clang
           Version: 11.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: janezz55 at gmail.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

Created attachment 24688
  --> https://bugs.llvm.org/attachment.cgi?id=24688&action=edit
.cpp file demonstrating bug

This will cause a crash in clang-11.1.0, but not in gcc-10.2.0:

constexpr auto a(auto&& s) noexcept
{
  return s[0];
}

template <char ...c>
constexpr auto operator "" _lol() noexcept
{
  return a((char[]){c...});
}

int main()
{
  return "123"_lol;
}

Compile with:
clang++ -std=c++20 t.cpp -o t

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