[1 of 1] Compiling Main ( prog.hs, prog.o )
prog.hs:9:1:
Couldn't match expected type `(t2, t3) -> t t1'
against inferred type `IO ()'
In the expression: print insideSum (2.0, 1.1)
In the expression: do print insideSum (2.0, 1.1)
In the definition of `main': main = do print insideSum (2.0, 1.1)