I also tried opam install ppx_jane
, which gave me such an error:
PS C:\Users\IDEA\git\hello> opam install ppx_jane
[NOTE] External dependency handling not supported for
OS family 'windows'.
You can disable this check using 'opam option
--global depext=false'
[ERROR] Package conflict!
* Missing dependency:
- variantslib >= v0.14
not available because the package is pinned to
version 109.15.02
No solution found, exiting