-/// Example:
-/// \code
-/// struct InvalidArgError {
-/// InvalidArgError() {}
-/// InvalidArgError(std::string S) : ArgName(S) {}
-/// std::string ArgName;
-/// };
-///
-/// namespace llvm {
-/// template<>
-/// struct ErrorOrUserDataTraits<InvalidArgError> : std::true_type {
-/// static error_code error() {
-/// return make_error_code(errc::invalid_argument);
-/// }
-/// };
-/// } // end namespace llvm
-///
-/// using namespace llvm;
-///
-/// ErrorOr<int> foo() {
-/// return InvalidArgError("adena");
-/// }
-///
-/// int main() {
-/// auto a = foo();
-/// if (!a && error_code(a) == errc::invalid_argument)
-/// llvm::errs() << a.getError<InvalidArgError>().ArgName << "\n";
-/// }
-/// \endcode
-///
-/// An implicit conversion to bool provides a way to check if there was an
-/// error. The unary * and -> operators provide pointer like access to the
-/// value. Accessing the value when there is an error has undefined behavior.
+/// Implicit conversion to bool returns true if there is a usable value. The
+/// unary * and -> operators provide pointer like access to the value. Accessing
+/// the value when there is an error has undefined behavior.