It is documented in the technical description of the language: https://caml.inria.fr/pub/docs/manual-ocaml/expr.html#sec150 . But it seems that indeed qualified record fields are not described in the tutorial part of the manual.
It is documented in the technical description of the language: https://caml.inria.fr/pub/docs/manual-ocaml/expr.html#sec150 . But it seems that indeed qualified record fields are not described in the tutorial part of the manual.