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Copyright © 2011 MLstate
This file is part of OPA.
OPA is free software: you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License, version 3, as published by
the Free Software Foundation.
OPA is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
more details.
You should have received a copy of the GNU Affero General Public License
along with OPA. If not, see <>.
* Magic interaction with the type system.
* @category compiler
* @destination private
* @stability stable
* {1 About this module}
* {1 Where should I start?}
* {1 What if I need more?}
* {1 Types defined in this module}
* A black type, e.g. for gathering heterogenous data inside a typed structure.
type black = external
* {1 Interface}
Magic = {{
* Introduce a [Obj.magic] on the Ocaml generated code.
* Not for casual user.
* If you want to bypass the opa typer, you should use @unsafe_cast instead.
* Introducing an @unsafe_cast has no impact on the generated code, the
* directive is simply discarded by the low level code generator.
id =
* Transforming a value into its black representation.
black = :'a -> black
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