the docs at https://dune.readthedocs.io/en/latest/variants.html say to use (using library_variants 0.2) but the latest dune version in opam, 1.10.0, will only work with library_variants 0.1. not sure if that’s a documentation bug or if I need to pin a version of dune from git or something
readthedocs is continuously updated with what is in the master of github.com/ocaml/dune. You can select the doc for the stable version via the selector at the bottom left of the page, or by replacing latest by stable in the URL.
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