  Let R be a Gorenstein local domain of dimension one. We show that a nonfree
maximal Cohen--Macaulay R-module M possessing more than one nonfree
indecomposable summand in the middle term of the almost split sequence ending
in M has a nonvanishing self extension. In other words, we show that the
Huneke--Wiegand conjecture is affirmative for such R-modules M.
