// seems to be how cgo has worked historically.
				sb.WriteString("_Ctype_void")
			}
			sb.WriteString(", error)")
		}
	}

	sb.WriteString("{ ")

	// Define _cgoN for each argument value.
	// Write _cgoCheckPointer calls to sbCheck.
	var sbCheck bytes.Buffer
	for i, param := range params {
		origArg := args[i]
		arg, nu := p.mangle(f, &args[i], true)
		if nu {