= note: ld: warning: ignoring duplicate libraries: '-lSystem'
          ld: Undefined symbols:
            ___addtf3, referenced from:
                std::num::test_num::h83194c034ce7125a in std-a7f7c4c812353510.std.3e4ab7aa3f61e492-cgu.12.rcgu.o
            ___divtf3, referenced from:
                std::num::test_num::h83194c034ce7125a in std-a7f7c4c812353510.std.3e4ab7aa3f61e492-cgu.12.rcgu.o
            ___multf3, referenced from:
                std::num::test_num::h83194c034ce7125a in std-a7f7c4c812353510.std.3e4ab7aa3f61e492-cgu.12.rcgu.o
            ___subtf3, referenced from:
                std::num::test_num::h83194c034ce7125a in std-a7f7c4c812353510.std.3e4ab7aa3f61e492-cgu.12.rcgu.o
            ___trunctfdf2, referenced from:
                _$LT$$RF$T$u20$as$u20$core..fmt..Debug$GT$::fmt::h8dd8a3b2b4bc54ac in std-a7f7c4c812353510.std.3e4ab7aa3f61e492-cgu.06.rcgu.o
                core::fmt::float::_$LT$impl$u20$core..fmt..Debug$u20$for$u20$f128$GT$::fmt::h0686fe3ef7164d45 in std-a7f7c4c812353510.std.3e4ab7aa3f61e492-cgu.10.rcgu.o
            ___unordtf2, referenced from:
                std::num::test_num::h83194c034ce7125a in std-a7f7c4c812353510.std.3e4ab7aa3f61e492-cgu.12.rcgu.o
                std::num::test_num::h83194c034ce7125a in std-a7f7c4c812353510.std.3e4ab7aa3f61e492-cgu.12.rcgu.o
                std::num::test_num::h83194c034ce7125a in std-a7f7c4c812353510.std.3e4ab7aa3f61e492-cgu.12.rcgu.o
                std::num::test_num::h83194c034ce7125a in std-a7f7c4c812353510.std.3e4ab7aa3f61e492-cgu.12.rcgu.o
                std::num::test_num::h83194c034ce7125a in std-a7f7c4c812353510.std.3e4ab7aa3f61e492-cgu.12.rcgu.o
          clang: error: linker command failed with exit code 1 (use -v to see invocation)
---
          ld: Undefined symbols:
            ___extenddftf2, referenced from:
                __RNvNtCsgSq1suy33ib_12clippy_utils6consts19lit_to_mir_constant in libclippy_utils-52261686d0193f09.rlib[10](clippy_utils-52261686d0193f09.clippy_utils.c495e003dc0e053d-cgu.07.rcgu.o)
            ___trunctfdf2, referenced from:
                __RINvXs1_NtCsgSq1suy33ib_12clippy_utils6constsNtB6_8ConstantNtNtCsdSdPP26wXhD_4core4hash4Hash4hashNtCsgzWzvnNrs6k_10rustc_hash8FxHasherEB8_ in libclippy_utils-52261686d0193f09.rlib[10](clippy_utils-52261686d0193f09.clippy_utils.c495e003dc0e053d-cgu.07.rcgu.o)