こんな感じにすると
@convention(c)使える。 import Foundation public func isEqual(_ lhs: Any, _ rhs: Any) -> Bool { let lhsType = type(of: lhs) let rhsType = type(of: rhs) guard lhsType == rhsType else { return false } guard let witnessTable = swift_conformsToProtocol(lhsType, EquatableProtocolDescriptor) else { return false } let theType = unsafeBitCast(lhsType, to: UnsafeRawPointer.self) return withUnsafePointer(to: lhs) { lhsPtr in withUnsafePointer(to: rhs) { rhsPtr in AnyEquatable_internalIsEqual(lhsPtr, rhsPtr, theType, witnessTable) } } } @_silgen_name("swift_conformsToProtocol") func swift_conformsToProtocol(_: Any.Type, _: UnsafeRawPointer) -> UnsafeRawPointer? func load<T>(symbol: String) -> T { if let sym = dlsym(dlopen(nil, RTLD_LAZY), symbol) { return unsafeBitCast(sym, to: T.self) } let errorString = String(validatingUTF8: dlerror()) fatalError("Finding symbol \(symbol) failed: \(errorString ?? "unknown error")") } let AnyEquatable_internalIsEqual: @convention(c) (UnsafeRawPointer, UnsafeRawPointer, UnsafeRawPointer, UnsafeRawPointer) -> Bool = load(symbol: "AnyEquatable_internalIsEqual") let EquatableProtocolDescriptor: UnsafeRawPointer = load(symbol: "$sSQMp") @_silgen_name("AnyEquatable_internalIsEqual") func _internalIsEqual<T: Equatable>(_ lhs: T, rhs: T) -> Bool { return lhs == rhs } (edited)