tcfail043.hs:16:
    Conflicting definitions for: `and'
	Defined at tcfail043.hs:42
	Imported from Prelude at tcfail043.hs:16
 
tcfail043.hs:16:
    Conflicting definitions for: `null'
	Defined at tcfail043.hs:57
	Imported from Prelude at tcfail043.hs:16


Compilation had errors