blob: 9014b643df349bcfaab9b6900940e5984a0f3ca9 (
plain)
1
2
3
4
5
6
|
tcfail154.hs:12:10:
Variable ‘a’ occurs more often than in the instance head
in the constraint: C a a
(Use UndecidableInstances to permit this)
In the instance declaration for ‘Eq (T a)’
|