[llvm-bugs] [Bug 44047] New: [C++20] lambda expression in unevaluated context

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44047

            Bug ID: 44047
           Summary: [C++20] lambda expression in unevaluated context
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Keywords: compile-fail, missing-feature
          Severity: normal
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs at nondot.org
          Reporter: trass3r 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

https://godbolt.org/z/u4EaXs

#include <memory>
#include <stdio.h>

void test(const char* file)
{
    auto f = std::unique_ptr<FILE, decltype([](FILE* f){ return fclose(f);
})>(fopen(file, "r"));
}


$ clang -Wall -W -std=c++2a -Os
error: lambda expression in an unevaluated operand

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