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Emit a sensible error message if one or more of the parameters isn't enough context to instantiate a polymorphic function

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This commit is contained in:
Patrick Walton 2010-10-27 15:02:52 -07:00
parent b3c4c1426a
commit 679dca8541
1 changed files with 9 additions and 4 deletions
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13
src/boot/me/type.ml
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@ -673,14 +673,19 @@ let check_stmt (cx:Semant.ctxt) : (fn_ctx -> Ast.stmt -> unit) =
in
let arg_ty_opts = Array.map (fun ty -> Some ty) arg_tys in
ignore (demand_fn ~param_handler:param_handler arg_ty_opts ty);
let get_subst subst_opt =
let get_subst i subst_opt =
match subst_opt with
Some subst -> subst
| None ->
Common.bug ()
"internal_check_outer_lval: subst not found"
Common.err
None
"not enough context to instantiate parameter %d of the \
function with type '%a'; please supply type parameters \
explicitly"
(i + 1)
sprintf_ltype lty
in
let substs = Array.map get_subst substs in
let substs = Array.mapi get_subst substs in
begin
match beta_reduce (Semant.lval_base_id lval) lty substs with
LTYPE_mono ty -> yield_ty ty