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Add a "param handler" to demand_fn for use in automatic type parameter instantiation

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This commit is contained in:
Patrick Walton 2010-08-26 11:22:00 -07:00
parent ff9ecc1128
commit de5c6f111c
1 changed files with 18 additions and 12 deletions
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30
src/boot/me/type.ml
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@ -153,7 +153,11 @@ let check_stmt (cx:Semant.ctxt) : (fn_ctx -> Ast.stmt -> unit) =
Ast.TY_rec ty_rec -> ty_rec
| ty -> type_error "record" ty
in
let demand_fn (arg_tys:Ast.ty option array) (actual:Ast.ty) : Ast.ty =
let demand_fn
?param_handler:(param_handler=demand)
(arg_tys:Ast.ty option array)
(actual:Ast.ty)
: Ast.ty =
let expected = lazy begin
Format.fprintf Format.str_formatter "fn(";
let print_arg_ty i arg_ty_opt =
@ -173,7 +177,10 @@ let check_stmt (cx:Semant.ctxt) : (fn_ctx -> Ast.stmt -> unit) =
type_error (Lazy.force expected) ty;
let in_slot_tys = Array.map get_slot_ty in_slots in
let maybe_demand a_opt b =
match a_opt with None -> () | Some a -> demand a b
match a_opt, b with
None, _ -> ()
| Some a, Ast.TY_param _ -> param_handler a b
| Some a, _ -> demand a b
in
Common.arr_iter2 maybe_demand arg_tys in_slot_tys;
get_slot_ty (ty_sig.Ast.sig_output_slot)
@ -497,6 +504,12 @@ let check_stmt (cx:Semant.ctxt) : (fn_ctx -> Ast.stmt -> unit) =
| TYPAT_fn arg_tys, LTYPE_mono actual ->
ignore (demand_fn (Array.map (fun ty -> Some ty) arg_tys) actual);
yield_ty actual
| TYPAT_fn _, LTYPE_poly (_, _) ->
(* FIXME: auto-instantiate *)
Common.unimpl
None
"instantiation of polymorphic function types; please supply type \
parameters explicitly, sorry"
| TYPAT_wild, (LTYPE_poly _ as lty) ->
Common.err
None
@ -504,19 +517,12 @@ let check_stmt (cx:Semant.ctxt) : (fn_ctx -> Ast.stmt -> unit) =
type '%a'; supply type parameters explicitly"
sprintf_ltype lty
| TYPAT_ty expected, (LTYPE_poly _ as lty) ->
(* FIXME: auto-instantiate *)
Common.unimpl
Common.err
None
"sorry, automatic polymorphic instantiation of %a to %a isn't \
supported yet; please supply type parameters explicitly"
"not enough context to automatically instantiate '%a' to '%a'; \
please supply type parameters explicitly"
sprintf_ltype lty
Ast.sprintf_ty expected
| TYPAT_fn _, (LTYPE_poly _) ->
(* FIXME: auto-instantiate *)
Common.unimpl
None
"sorry, automatic polymorphic instantiation of function types \
isn't supported yet; please supply type parameters explicitly"
| _, LTYPE_module _ ->
Common.err None "can't refer to a module as a first-class value"