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  • Support for %map.A.B.C syntax to use values from a specific module, rather
    than the one in scope.


  • Depend on ppxlib instead of (now deprecated) ppx_core and ppx_driver.


  • Dropped Open_in_body support from ppx_let, since it was only ever used
    in confusing chains of Let_syntax modules that introduced other
    Let_syntax modules in the "body" (e.g. for defining Commands whose
    bodies use Async). In this case it was decided that the better
    practice is to be explicit with open ___.Let_syntax at the different
    transition points, even though this is more verbose.