collect_pat (AsPat a pat) acc = collect_lpat pat acc
collect_pat (ParPat pat) acc = collect_lpat pat acc
collect_pat (ListPat pats _) acc = foldr collect_lpat acc pats
collect_pat (PArrPat pats _) acc = foldr collect_lpat acc pats
collect_pat (TuplePat pats _ _) acc = foldr collect_lpat acc pats
collect_pat (AsPat a pat) acc = collect_lpat pat acc
collect_pat (ParPat pat) acc = collect_lpat pat acc
collect_pat (ListPat pats _) acc = foldr collect_lpat acc pats
collect_pat (PArrPat pats _) acc = foldr collect_lpat acc pats
collect_pat (TuplePat pats _ _) acc = foldr collect_lpat acc pats