From: Henri DF <henri.dubois-ferriere@epfl.ch>
To: caml-list@inria.fr
Subject: [Caml-list] odd typing behavior
Date: Mon, 21 Jun 2004 16:05:22 +0200 (CEST) [thread overview]
Message-ID: <Pine.LNX.4.44.0406211557500.6819-100000@lcmpc4.epfl.ch> (raw)
Here is a boiled-down example of a problem that i can't figure out.
Can anyone explain this ?
thanks
henri
version 1:
---------
Compiling this fails with
File "proto/str/test.ml", line 5, characters 5-109:
The abbreviation c expands to type < dump_state : persist_t >
but is used with type < .. >
let h = Hashtbl.create 1
type persist_t = {rt : int}
class c =
object(s)
initializer
Hashtbl.replace h 1 (s :> c);
method dump_state = {rt=1 }
end
version 2:
---------
Same as version 1, except we use a float rather than a record
for type persist_t. This one compiles fine.
let h = Hashtbl.create 1
type persist_t = float
class c =
object(s)
initializer
Hashtbl.replace h 1 (s :> c);
method dump_state = 1.0
end
version 3:
---------
Same as version 1, except the first 2 lines are interchanged. This one
compiles fine.
type persist_t = {rt : int}
let h = Hashtbl.create 1
class c =
object(s)
initializer
Hashtbl.replace h 1 (s :> c);
method dump_state = {rt=1 }
end
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next reply other threads:[~2004-06-21 14:05 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-21 14:05 Henri DF [this message]
2004-06-21 14:25 ` Nicolas Cannasse
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