tcfail040.hs:19:
- Ambiguous type variable(s) `a'
- in the constraint `ORD a'
- arising from use of `<<' at tcfail040.hs:19
+ Ambiguous type variable(s) `a' in the constraint `ORD a'
+ arising from use of `<<' at tcfail040.hs:19
+ In the first argument of `===', namely `<<'
+ In the right-hand side of a pattern binding: << === <<
Compilation had errors