code.swift

override func llvmType() -> LLVMTypeRef {
  // a function with a 'Void' argument is a
  // special case: it means '0 arguments'.
  var args: [LLVMTypeRef] = []
  if self.argType != VoidType() {
      args.append(self.argType.llvmType())
  }

  return LLVMFunctionType(
    self.retType.llvmType(),
    args.count > 0 ? &args[0] : nil,
    UInt32(args.count),
    0 // 0: not variadic
  )
}

error.txt

TypeAnn.swift:157:39: error: result values in '? :' expression have mismatching types
  'inout LLVMTypeRef' (aka 'inout COpaquePointer') and '_'
            args.count > 0 ? &args[0] : nil,
                             ~~~~~~~~ ^ ~~~