[llvm-bugs] [Bug 41994] New: [windows-only] #include <vector> breaks structured binding for aggregated types

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https://bugs.llvm.org/show_bug.cgi?id=41994

            Bug ID: 41994
           Summary: [windows-only] #include <vector> breaks structured
                    binding for aggregated types
           Product: clang
           Version: 8.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++17
          Assignee: unassignedclangbugs at nondot.org
          Reporter: development at jordi.vilar.cat
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

The following code, compiled with -std=c++17, fails in windows build of
clang-8, compiles correctly in linux build of the same clang version. The
diagnostics message says:
    error: cannot decompose this type; 'std::tuple_size<const
aggregated_type>::value' is not a valid integral constant expression

#include <vector>

struct aggregated_type
{
    double a, b, c, d;
};

int main(int, char**)
{
    const aggregated_type aggregate{};
    const auto&[a, b, c, d] = aggregate;
}

commenting out the #include <vector> line, compiles as expected

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