59 lines
2.5 KiB
OCaml
59 lines
2.5 KiB
OCaml
(* Operations on core types *)
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open Typedtree
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val begin_def: unit -> unit
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(* Raise the variable level by one at the beginning of a definition. *)
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val end_def: unit -> unit
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(* Lower the variable level by one at the end of a definition *)
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val newvar: unit -> type_expr
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(* Return a fresh variable *)
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val repr: type_expr -> type_expr
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(* Return the canonical representative of a type. *)
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val generalize: type_expr -> unit
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(* Generalize in-place the given type *)
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val make_nongen: type_expr -> unit
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(* Make non-generalizable the given type *)
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val instance: type_expr -> type_expr
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(* Take an instance of a type scheme *)
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val instance_constructor:
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constructor_description -> type_expr list * type_expr
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(* Same, for a constructor *)
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val instance_label: label_description -> type_expr * type_expr
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(* Same, for a label *)
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val unify: Env.t -> type_expr -> type_expr -> unit
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(* Unify the two types given. Raise [Unify] if not possible. *)
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val filter_arrow: Env.t -> type_expr -> type_expr * type_expr
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(* A special case of unification (with 'a -> 'b). *)
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val moregeneral: Env.t -> type_expr -> type_expr -> bool
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(* Check if the first type scheme is more general than the second. *)
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val equal: Env.t -> type_expr list -> type_expr ->
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type_expr list -> type_expr -> bool
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(* [equal env [x1...xn] tau [y1...yn] sigma]
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checks whether the parameterized types
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[/\x1.../\xn.tau] and [/\y1.../\yn.sigma] are equivalent. *)
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val closed_schema: type_expr -> bool
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(* Check whether the given type scheme contains no non-generic
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type variables *)
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val nondep_type: Env.t -> Ident.t -> type_expr -> type_expr
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(* Return a type equivalent to the given type but without
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references to the given module identifier. Raise [Not_found]
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if no such type List.exists. *)
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val free_type_ident: Env.t -> Ident.t -> type_expr -> bool
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(* Test whether the given type identifier occurs free
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in the given type expression. *)
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val is_generic: type_expr -> bool
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(* Test whether the given type variable is generic *)
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val arity: type_expr -> int
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(* Return the arity (as for curried functions) of the given type. *)
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val none: type_expr
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(* A dummy type expression *)
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val substitute:
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type_expr list -> type_expr list -> type_expr -> type_expr
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(* [substitute [v1...vN] [t1...tN] t]
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returns a copy of [t] where the [vi] are replaced
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by the [ti]. *)
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exception Unify
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