ghc/tests/typecheck/should_fail/tcfail080.stderr

   1
   2 tcfail080.hs:11:
   3     Ambiguous type variable(s)
   4     `ar9'
   5         in the constraint `Collection ar9 arc'
   6         arising from use of `singleton' at tcfail080.hs:11
   7
   8
   9 Compilation had errors