Found mach-o universal 0x2737b30

[itmayi]

Found mach-o universal 0x2737b30
swiftd: /usr/local/include/llvm/Support/Casting.h:95: static bool llvm::isa_impl_cl<llvm::object::MachOObjectFile, const llvm::object::SymbolicFile *>::doit(const From *) [To = llvm::object::MachOObjectFile, From = const llvm::object::SymbolicFile *]: Assertion `Val && "isa<> used on a null pointer"' failed.
Aborted (core dumped)
when i use ./swiftd a.binary -o xx to dump header files, some errors occur.how can i make it work ?