tcfail008.hs:3: No instance for: `Num [taDV]'
    arising from the literal 2 at tcfail008.hs:3
 
tcfail008.hs:3: No instance for: `Num [taDV]'
    arising from the literal 2 at tcfail008.hs:3
 
tcfail008.hs:3: No instance for: `Num [Int]'
    arising from the literal 2 at tcfail008.hs:3

Compilation had errors