[llvm-bugs] [Bug 49409] New: const variable cannot be implicitly captured in a lambda with no capture-default specified

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49409

            Bug ID: 49409
           Summary: const variable cannot be implicitly captured in a
                    lambda with no capture-default specified
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs at nondot.org
          Reporter: hewillk 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

Clang rejected the following code with -std=c++20 flag (but GCC and MSVC do
not):


auto f() {
  const auto x = 1;
  return [] (auto) { return x; };
}

godbolt: https://godbolt.org/z/1174Tv

discussion:
https://stackoverflow.com/questions/66456916/implicitly-capture-const-variable-in-a-template-lambda-with-no-capture-default-s

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