[compiler-hacking] Use of opam-compiler-conf: install packages

[Olivier Nicole]

On 04/04/2016 06:46 PM, Jeremy Yallop wrote:
> On 4 April 2016 at 13:45, Olivier Nicole
> <olivier.nicole at ensta-paristech.fr> wrote:
>> On 04/04/2016 07:36 AM, Jeremy Yallop wrote:
>>> Is your OPAM package list up-to-date?  Recent versions of Core (e.g.
>>> 113.33.00) should meet the version constraints for modified trunk
>>> compilers:
>>>
>>>    https://github.com/ocaml/opam-repository/blob/master/packages/core/core.113.33.00/opam#L29
>>>
>>> Whether they'll actually build is another question, of course.
>>
>> Thank you, I just needed to do an `opam update`. But now the ppx-tools
>> and sexplibs packages fail to build, and I'm quite sure it is not due to
>> my changes in translcore.ml (I merely changed a condition to `true` so
>> that records are always updated fieldwise). For example, the build of
>> ppx_tools fails with:
>>
>>     File "src/gen/common.ml", line 73, characters 24-34:
>>     Error: This expression has type Types.constructor_arguments
>>            but an expression was expected of type Types.type_expr list
>>
>> Am I missing something or did my changes really break the package?
> 
> It's quite likely that the released versions of ppx-tools and sexplib
> don't compile with OCaml trunk.  Packages that depend on compiler-libs
> tend to break whenever there's a significant change to a module such
> as Parsetree or Types.
> 

Working with version 4.02.3 fixed the problem. Thank you!

Best regards,

Olivier