[wg-camlp4] A new branch to experiment with extension points
lpw25 at cam.ac.uk
Mon Mar 4 19:09:12 GMT 2013
>Extensions on the same categories:
> [#lid expr]
This delimiter isn't technically safe (it could be made safe but its
probably not worth the effort), might I suggest [%lid expr] as an
> postfix syntax: ... [@@id expr]
> prefix syntax: [^^id expr] ...
How about including "Item" extensions "[%%lid expr]"? I would rather not
force people to use "include [%id expr]". I can imagine syntax extensions
that might want to be used as both a strucuture item and a module
>Attributes on constructor declarations (needed for constant
>constructors, in particular):
> type t =
> | A [@id expr] [@id expr]
> | B [@id expr] [@id expr] of ...
I agree that we need a special syntax for variant constructor attributes.
type t =
| A with id, id(expr)
| B of ... with id(expr), id
We could also allow this for convenient record label attributes. I think
this syntax is already used in type-conv, it fits in with the "with"
attributes for type declarations, and is a lighter syntax than the
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