ghc/tests/typecheck/should_fail/tcfail073.stderr

   1
   2 Duplicate or overlapping instance declarations:
   3   tcfail073.hs:7: {Eq (a, b)}
   4   /home/simonmar/builds/i386-unknown-linux/ghc/compiler/../lib/std/PrelTup.hi:66: {Eq (a,
   5                                                                                        b)}
   6
   7 tcfail073.hs:8:
   8     Could not deduce `Eq a' from the context (Eq (a, b))
   9     Probable fix:
  10         Add `Eq a' to the instance declaration context
  11     arising from use of `==' at tcfail073.hs:8
  12     In the right-hand side of an equation for `==': m == o