* obscur error message
@ 2010-01-26 8:06 Tiphaine Turpin
0 siblings, 0 replies; only message in thread
From: Tiphaine Turpin @ 2010-01-26 8:06 UTC (permalink / raw)
To: caml-list
Hi,
I'm puzzled about the type error returned with the following code (fix :
remove "fs"). Assuming value "mgu" and constructor "Var" are defined, is
it reasonable to report a type error about "subst" rather than the
unbound value "fs" ? I would expect the type-checker to first
successfully type the folded function, (with type (var_name * term) list
-> var_name * term -> (var_name * term) list) and then complain about
unbound value fs.
Tiphaine
let genereal_unify subst eqs =
List.fold_left (fun subst (x, t) -> mgu subst (Var x) t) subst fs eqs
File "prolog.ml", line 475, characters 42-47: (* i.e., second occurrence
of subst *))
Error: This expression has type 'a -> 'b but is here used with type
(var_name * term) list
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2010-01-26 8:06 obscur error message Tiphaine Turpin
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