3 Duplicate or overlapping instance declarations
4 for `A B' at tcfail023.hs:14 and tcfail023.hs:11
7 Couldn't match `B' against `Bool'
10 In the right-hand side of an equation for `op': True
13 Couldn't match `B' against `Bool'
16 In the right-hand side of an equation for `op': True
19 Compilation had errors