Build errors on Mac OS 11 beta (Clang 12) (error: use of overloaded operator '!=' is ambiguous)

[yesudeep]

Use --sandbox_debug to see verbose messages from the sandbox wrapped_clang failed: error executing command 
  (cd /private/var/tmp/_bazel_yesudeep/148f9f6ebca6e47e7d6d5ed427a82e62/sandbox/darwin-sandbox/1184/execroot/__main__ && \
  exec env - \
    APPLE_SDK_PLATFORM=MacOSX \
    APPLE_SDK_VERSION_OVERRIDE=11.0 \
    PATH='/Users/yesudeep/.cargo/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Library/TeX/texbin:/usr/local/go/bin:/usr/local/share/dotnet:~/.dotnet/tools:/Library/Apple/usr/bin:/Library/Frameworks/Mono.framework/Versions/Current/Commands:/Applications/Wireshark.app/Contents/MacOS:/Users/yesudeep/code/src/fzf/bin' \
    XCODE_VERSION_OVERRIDE=12.0.0.12A8189h \
  external/local_config_cc/wrapped_clang '-D_FORTIFY_SOURCE=1' -fstack-protector -fcolor-diagnostics -Wall -Wthread-safety -Wself-assign -fno-omit-frame-pointer -O0 -DDEBUG '-std=c++11' -iquote external/zug -iquote bazel-out/darwin-fastbuild/bin/external/zug -iquote external/boost -iquote bazel-out/darwin-fastbuild/bin/external/boost -iquote external/com_github_catchorg_catch2 -iquote bazel-out/darwin-fastbuild/bin/external/com_github_catchorg_catch2 -iquote external/bazel_tools -iquote bazel-out/darwin-fastbuild/bin/external/bazel_tools -isystem external/zug/include -isystem bazel-out/darwin-fastbuild/bin/external/zug/include -isystem external/boost -isystem bazel-out/darwin-fastbuild/bin/external/boost -isystem external/boost/boost/mpl -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/mpl -isystem external/boost/boost/move -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/move -isystem external/boost/boost/assert -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/assert -isystem external/boost/boost/detail -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/detail -isystem external/boost/boost/limits -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/limits -isystem external/boost/boost/static_assert -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/static_assert -isystem external/boost/boost/preprocessor -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/preprocessor -isystem external/boost/boost/range -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/range -isystem external/boost/boost/array -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/array -isystem external/boost/boost/config -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/config -isystem external/boost/boost/version -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/version -isystem external/boost/boost/core -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/core -isystem external/boost/boost/functional -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/functional -isystem external/boost/boost/container_hash -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/container_hash -isystem external/boost/boost/integer -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/integer -isystem external/boost/boost/cstdint -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/cstdint -isystem external/boost/boost/type_traits -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/type_traits -isystem external/boost/boost/swap -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/swap -isystem external/boost/boost/throw_exception -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/throw_exception -isystem external/boost/boost/current_function -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/current_function -isystem external/boost/boost/exception -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/exception -isystem external/boost/boost/concept_check -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/concept_check -isystem external/boost/boost/concept -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/concept -isystem external/boost/boost/concept_archetype -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/concept_archetype -isystem external/boost/boost/iterator -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/iterator -isystem external/boost/boost/utility -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/utility -isystem external/boost/boost/noncopyable -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/noncopyable -isystem external/boost/boost/optional -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/optional -isystem external/boost/boost/none -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/none -isystem external/boost/boost/type -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/type -isystem external/boost/boost/ref -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/ref -isystem external/boost/boost/regex -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/regex -isystem external/boost/boost/predef -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/predef -isystem external/boost/boost/smart_ptr -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/smart_ptr -isystem external/boost/boost/align -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/align -isystem external/boost/boost/scoped_array -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/scoped_array -isystem external/boost/boost/checked_delete -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/checked_delete -isystem external/boost/boost/scoped_ptr -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/scoped_ptr -isystem external/boost/boost/shared_array -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/shared_array -isystem external/boost/boost/shared_ptr -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/shared_ptr -isystem external/boost/boost/tuple -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/tuple -isystem external/boost/boost/variant -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/variant -isystem external/boost/boost/call_traits -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/call_traits -isystem external/boost/boost/math -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/math -isystem external/boost/boost/atomic -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/atomic -isystem external/boost/boost/fusion -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/fusion -isystem external/boost/boost/function_types -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/function_types -isystem external/boost/boost/get_pointer -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/get_pointer -isystem external/boost/boost/typeof -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/typeof -isystem external/boost/boost/lambda -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/lambda -isystem external/boost/boost/mp11 -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/mp11 -isystem external/boost/boost/type_index -isystem bazel-out/darwin-fastbuild/bin/external/boost/boost/type_index -isystem external/com_github_catchorg_catch2/single_include -isystem bazel-out/darwin-fastbuild/bin/external/com_github_catchorg_catch2/single_include -MD -MF bazel-out/darwin-fastbuild/bin/external/zug/test/transducer/_objs/product_test/product.d -DBOOST_FALLTHROUGH '-DZUG_VARIANT_STD=0' '-DZUG_VARIANT_BOOST=1' '-DZUG_ENABLE_BOOST=1' '-DHAVE_BAZEL_BUILD=1' -DCATCH_CONFIG_MAIN '-frandom-seed=bazel-out/darwin-fastbuild/bin/external/zug/test/transducer/_objs/product_test/product.o' -isysroot __BAZEL_XCODE_SDKROOT__ -F__BAZEL_XCODE_SDKROOT__/System/Library/Frameworks -F__BAZEL_XCODE_DEVELOPER_DIR__/Platforms/MacOSX.platform/Developer/Library/Frameworks '-mmacosx-version-min=11.0' -DHAVE_BAZEL_BUILD '-std=c++2a' -Wall -Wreturn-type -Wuninitialized -Wunused-result '-Werror=narrowing' '-Werror=reorder' -Wunused-local-typedefs '-Werror=conversion-null' '-Werror=overlength-strings' '-Werror=pointer-arith' '-Werror=varargs' '-Werror=vla' '-Werror=write-strings' -Wmissing-declarations '-fdiagnostics-color=always' -no-canonical-prefixes -Wno-builtin-macro-redefined '-D__DATE__="redacted"' '-D__TIMESTAMP__="redacted"' '-D__TIME__="redacted"' -c external/zug/test/transducer/product.cpp -o bazel-out/darwin-fastbuild/bin/external/zug/test/transducer/_objs/product_test/product.o)
Execution platform: @local_config_platform//:host

Use --sandbox_debug to see verbose messages from the sandbox
In file included from external/zug/test/transducer/product.cpp:14:
external/zug/include/zug/transducer/product.hpp:33:53: error: use of overloaded operator '!=' is ambiguous (with operand types 'zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>>::iterator' and 'zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>>::iterator')
    for (++first; !state_is_reduced(state) && first != last; ++first) {
                                              ~~~~~ ^  ~~~~
external/zug/include/zug/transducer/product.hpp:48:28: note: in instantiation of function template specialization 'zug::detail::reduce_nested_non_empty_product<const zug::last_t &, zug::meta::bottom, zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>> &, const unsigned long>' requested here
            return detail::reduce_nested_non_empty_product(
                           ^
external/zug/include/zug/detail/iterator_facade.hpp:119:10: note: candidate function
    bool operator!=(const DerivedT& rhs) const
         ^
external/zug/include/zug/detail/iterator_facade.hpp:115:10: note: candidate function
    bool operator==(const DerivedT& rhs) const
         ^
external/zug/include/zug/detail/iterator_facade.hpp:115:10: note: candidate function (with reversed parameter order)
In file included from external/zug/test/transducer/product.cpp:12:
In file included from external/zug/include/zug/into_vector.hpp:11:
In file included from external/zug/include/zug/meta.hpp:11:
In file included from external/zug/include/zug/into.hpp:13:
In file included from external/zug/include/zug/transduce.hpp:11:
In file included from external/zug/include/zug/reduce.hpp:11:
external/zug/include/zug/detail/is_non_empty.hpp:23:21: error: use of overloaded operator '!=' is ambiguous (with operand types 'decltype(__c.begin())' (aka 'zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>>::iterator') and 'decltype(__c.end())' (aka 'zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>>::iterator'))
    return begin(r) != end(r) && is_non_empty(rs...);
           ~~~~~~~~ ^  ~~~~~~
external/zug/include/zug/reduce.hpp:71:20: note: in instantiation of function template specialization 'zug::detail::is_non_empty<zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>>>' requested here
    return detail::is_non_empty(ranges...)
                   ^
external/zug/include/zug/into.hpp:34:5: note: in instantiation of function template specialization 'zug::transduce<zug::composed<(lambda at external/zug/include/zug/transducer/product.hpp:46:17)>, const zug::output_t &, std::__1::back_insert_iterator<std::__1::vector<std::__1::tuple<unsigned long, unsigned long>, std::__1::allocator<std::__1::tuple<unsigned long, unsigned long> > > >, zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>> &>' requested here
    transduce(std::forward<XformT>(xform),
    ^
external/zug/include/zug/into_vector.hpp:33:12: note: in instantiation of function template specialization 'zug::into<std::__1::vector<std::__1::tuple<unsigned long, unsigned long>, std::__1::allocator<std::__1::tuple<unsigned long, unsigned long> > >, zug::composed<(lambda at external/zug/include/zug/transducer/product.hpp:46:17)>, zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>> &>' requested here
    return into(result_t{},
           ^
external/zug/test/transducer/product.cpp:65:16: note: in instantiation of function template specialization 'zug::into_vector<zug::composed<(lambda at external/zug/include/zug/transducer/product.hpp:46:17)>, zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>> &>' requested here
    auto res = into_vector(product(idx), idx);
               ^
external/zug/include/zug/detail/iterator_facade.hpp:119:10: note: candidate function
    bool operator!=(const DerivedT& rhs) const
         ^
external/zug/include/zug/detail/iterator_facade.hpp:115:10: note: candidate function
    bool operator==(const DerivedT& rhs) const
         ^
external/zug/include/zug/detail/iterator_facade.hpp:115:10: note: candidate function (with reversed parameter order)
In file included from external/zug/test/transducer/product.cpp:14:
external/zug/include/zug/transducer/product.hpp:33:53: error: use of overloaded operator '!=' is ambiguous (with operand types 'zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>>::iterator' and 'zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>>::iterator')
    for (++first; !state_is_reduced(state) && first != last; ++first) {
                                              ~~~~~ ^  ~~~~
external/zug/include/zug/transducer/product.hpp:48:28: note: in instantiation of function template specialization 'zug::detail::reduce_nested_non_empty_product<const zug::output_t &, std::__1::back_insert_iterator<std::__1::vector<std::__1::tuple<unsigned long, unsigned long>, std::__1::allocator<std::__1::tuple<unsigned long, unsigned long> > > > &, zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>> &, const unsigned long &>' requested here
            return detail::reduce_nested_non_empty_product(
                           ^
external/zug/include/zug/into.hpp:34:5: note: in instantiation of function template specialization 'zug::transduce<zug::composed<(lambda at external/zug/include/zug/transducer/product.hpp:46:17)>, const zug::output_t &, std::__1::back_insert_iterator<std::__1::vector<std::__1::tuple<unsigned long, unsigned long>, std::__1::allocator<std::__1::tuple<unsigned long, unsigned long> > > >, zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>> &>' requested here
    transduce(std::forward<XformT>(xform),
    ^
external/zug/include/zug/into_vector.hpp:33:12: note: in instantiation of function template specialization 'zug::into<std::__1::vector<std::__1::tuple<unsigned long, unsigned long>, std::__1::allocator<std::__1::tuple<unsigned long, unsigned long> > >, zug::composed<(lambda at external/zug/include/zug/transducer/product.hpp:46:17)>, zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>> &>' requested here
    return into(result_t{},
           ^
external/zug/test/transducer/product.cpp:65:16: note: in instantiation of function template specialization 'zug::into_vector<zug::composed<(lambda at external/zug/include/zug/transducer/product.hpp:46:17)>, zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>> &>' requested here
    auto res = into_vector(product(idx), idx);
               ^
external/zug/include/zug/detail/iterator_facade.hpp:119:10: note: candidate function
    bool operator!=(const DerivedT& rhs) const
         ^
external/zug/include/zug/detail/iterator_facade.hpp:115:10: note: candidate function
    bool operator==(const DerivedT& rhs) const
         ^
external/zug/include/zug/detail/iterator_facade.hpp:115:10: note: candidate function (with reversed parameter order)
In file included from external/zug/test/transducer/product.cpp:12:
In file included from external/zug/include/zug/into_vector.hpp:11:
In file included from external/zug/include/zug/meta.hpp:11:
In file included from external/zug/include/zug/into.hpp:13:
In file included from external/zug/include/zug/transduce.hpp:11:
In file included from external/zug/include/zug/reduce.hpp:12:
In file included from external/zug/include/zug/detail/reduce_nested_non_empty.hpp:32:
external/zug/include/zug/detail/reduce_nested_non_empty_non_variadic.hpp:34:53: error: use of overloaded operator '!=' is ambiguous (with operand types 'zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>>::iterator' and 'zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>>::iterator')
    for (++first; !state_is_reduced(state) && first != last; ++first) {
                                              ~~~~~ ^  ~~~~
external/zug/include/zug/detail/reduce_nested_non_empty.hpp:51:12: note: in instantiation of function template specialization 'zug::detail::reduce_nested_non_empty_non_variadic<(lambda at external/zug/include/zug/transducer/product.hpp:47:16), std::__1::back_insert_iterator<std::__1::vector<std::__1::tuple<unsigned long, unsigned long>, std::__1::allocator<std::__1::tuple<unsigned long, unsigned long> > > >, zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>> &>' requested here
    return ZUG_REDUCE_NESTED_NON_EMPTY_NON_VARIADIC_IMPL(
           ^
external/zug/include/zug/detail/reduce_nested_non_empty.hpp:34:20: note: expanded from macro 'ZUG_REDUCE_NESTED_NON_EMPTY_NON_VARIADIC_IMPL'
    ::zug::detail::reduce_nested_non_empty_non_variadic
                   ^
external/zug/include/zug/into.hpp:34:5: note: in instantiation of function template specialization 'zug::transduce<zug::composed<(lambda at external/zug/include/zug/transducer/product.hpp:46:17)>, const zug::output_t &, std::__1::back_insert_iterator<std::__1::vector<std::__1::tuple<unsigned long, unsigned long>, std::__1::allocator<std::__1::tuple<unsigned long, unsigned long> > > >, zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>> &>' requested here
    transduce(std::forward<XformT>(xform),
    ^
external/zug/include/zug/into_vector.hpp:33:12: note: in instantiation of function template specialization 'zug::into<std::__1::vector<std::__1::tuple<unsigned long, unsigned long>, std::__1::allocator<std::__1::tuple<unsigned long, unsigned long> > >, zug::composed<(lambda at external/zug/include/zug/transducer/product.hpp:46:17)>, zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>> &>' requested here
    return into(result_t{},
           ^
external/zug/test/transducer/product.cpp:65:16: note: in instantiation of function template specialization 'zug::into_vector<zug::composed<(lambda at external/zug/include/zug/transducer/product.hpp:46:17)>, zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>> &>' requested here
    auto res = into_vector(product(idx), idx);
               ^
external/zug/include/zug/detail/iterator_facade.hpp:119:10: note: candidate function
    bool operator!=(const DerivedT& rhs) const
         ^
external/zug/include/zug/detail/iterator_facade.hpp:115:10: note: candidate function
    bool operator==(const DerivedT& rhs) const
         ^
external/zug/include/zug/detail/iterator_facade.hpp:115:10: note: candidate function (with reversed parameter order)
In file included from external/zug/test/transducer/product.cpp:14:
external/zug/include/zug/transducer/product.hpp:33:53: error: use of overloaded operator '!=' is ambiguous (with operand types 'zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>>::iterator' and 'zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>>::iterator')
    for (++first; !state_is_reduced(state) && first != last; ++first) {
                                              ~~~~~ ^  ~~~~
external/zug/include/zug/transducer/product.hpp:48:28: note: in instantiation of function template specialization 'zug::detail::reduce_nested_non_empty_product<const zug::output_t &, std::__1::back_insert_iterator<std::__1::vector<std::__1::tuple<unsigned long, unsigned long>, std::__1::allocator<std::__1::tuple<unsigned long, unsigned long> > > >, zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>> &, const unsigned long &>' requested here
            return detail::reduce_nested_non_empty_product(
                           ^
external/zug/include/zug/detail/reduce_nested_non_empty.hpp:51:12: note: in instantiation of function template specialization 'zug::detail::reduce_nested_non_empty_non_variadic<(lambda at external/zug/include/zug/transducer/product.hpp:47:16), std::__1::back_insert_iterator<std::__1::vector<std::__1::tuple<unsigned long, unsigned long>, std::__1::allocator<std::__1::tuple<unsigned long, unsigned long> > > >, zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>> &>' requested here
    return ZUG_REDUCE_NESTED_NON_EMPTY_NON_VARIADIC_IMPL(
           ^
external/zug/include/zug/detail/reduce_nested_non_empty.hpp:34:20: note: expanded from macro 'ZUG_REDUCE_NESTED_NON_EMPTY_NON_VARIADIC_IMPL'
    ::zug::detail::reduce_nested_non_empty_non_variadic
                   ^
external/zug/include/zug/into.hpp:34:5: note: in instantiation of function template specialization 'zug::transduce<zug::composed<(lambda at external/zug/include/zug/transducer/product.hpp:46:17)>, const zug::output_t &, std::__1::back_insert_iterator<std::__1::vector<std::__1::tuple<unsigned long, unsigned long>, std::__1::allocator<std::__1::tuple<unsigned long, unsigned long> > > >, zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>> &>' requested here
    transduce(std::forward<XformT>(xform),
    ^
external/zug/include/zug/into_vector.hpp:33:12: note: in instantiation of function template specialization 'zug::into<std::__1::vector<std::__1::tuple<unsigned long, unsigned long>, std::__1::allocator<std::__1::tuple<unsigned long, unsigned long> > >, zug::composed<(lambda at external/zug/include/zug/transducer/product.hpp:46:17)>, zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>> &>' requested here
    return into(result_t{},
           ^
external/zug/test/transducer/product.cpp:65:16: note: in instantiation of function template specialization 'zug::into_vector<zug::composed<(lambda at external/zug/include/zug/transducer/product.hpp:46:17)>, zug::sequence_range<unsigned long, zug::composed<(lambda at external/zug/include/zug/transducer/count.hpp:40:17), (lambda at external/zug/include/zug/transducer/take.hpp:41:17)>> &>' requested here
    auto res = into_vector(product(idx), idx);
               ^
external/zug/include/zug/detail/iterator_facade.hpp:119:10: note: candidate function
    bool operator!=(const DerivedT& rhs) const
         ^
external/zug/include/zug/detail/iterator_facade.hpp:115:10: note: candidate function
    bool operator==(const DerivedT& rhs) const
         ^
external/zug/include/zug/detail/iterator_facade.hpp:115:10: note: candidate function (with reversed parameter order)
5 errors generated.
INFO: Elapsed time: 139.441s, Critical Path: 32.68s
INFO: 1350 processes: 1350 darwin-sandbox.
FAILED: Build did NOT complete successfully

[arximboldi]

Are you using --std=c++20?