tcfail016.hs:9: Couldn't match the type
		    `PrelTup.(,) taRi' against `Expr'
    Expected: `Expr taRd'
    Inferred: `AnnExpr taRi'
    In the first argument of `g', namely `e1'
    In the first argument of `PrelBase.++', namely `(g e1)'
    In an equation for function `g':
	`g (App e1 e2) = (g e1) PrelBase.++ (g e2)'


Compilation had errors