TyVarEnv (ocaml.Typetexp.TyVarEnv)

val reset : unit -> unit

removes all type variables from scope

val with_local_scope : (unit -> 'a) -> 'a

Evaluate in a narrowed type-variable scope

type poly_univars

val make_poly_univars : string list -> poly_univars

remember that a list of strings connotes univars; this must always be paired with a check_poly_univars.

val check_poly_univars : 
  Env.t ->
  Location.t ->
  poly_univars ->
  Types.type_expr list

Verify that the given univars are universally quantified, and return the list of variables. The type in which the univars are used must be generalised

val instance_poly_univars : 
  Env.t ->
  Location.t ->
  poly_univars ->
  Types.type_expr list

Same as check_poly_univars, but instantiates the resulting type scheme (i.e. variables become Tvar rather than Tunivar)