[1 of 1] Compiling Main ( prog.hs, prog.o )
prog.hs:8:8:
Ambiguous type variable `a' in the constraint:
`Show a' arising from a use of `print' at prog.hs:8:8-12
Probable fix: add a type signature that fixes these type variable(s)
prog.hs:9:8:
Ambiguous type variable `a1' in the constraint:
`Show a1' arising from a use of `print' at prog.hs:9:8-12
Probable fix: add a type signature that fixes these type variable(s)