mpj1.m:016: Inferred :- func f(E, E, T4) = T4 <= (mpj1.coll(E, T4)).
mpj1.m:018: In clause for function `g'/1:
mpj1.m:018:   in function result term of clause head:
mpj1.m:018:   in argument 2 of functor `f/3':
mpj1.m:018:   type error in unification of argument
mpj1.m:018:   and constant `2'.
mpj1.m:018:   argument has type
mpj1.m:018:     string,
mpj1.m:018:   constant `2' has type
mpj1.m:018:     int.
mpj1.m:018:   The partial type assignment was:
mpj1.m:018:     HeadVar__2_2: T2
mpj1.m:018:     L_3: T2
mpj1.m:018:     V_4: string
mpj1.m:018:     V_5: string <= mpj1.coll(string, T2)