Experimental Vim9 support by AndrewRadev · Pull Request #443 · vim-ruby/vim-ruby

* master:
  Add a spec for case-in pattern matching
  Only consider `in` at the beginning of a line
  Fix indentation for `in` keyword
  Fix tag maps
  Include "" and "." in 'path'
  Avoid recursively triggering in tag/file maps
  Prevent endless defs from starting a method region
  Add highlighting for shareable_constant_value