Rightward assignment `=>` converted to `in` when preceded by `in` in a prior line

[nixme]

Example:

puts SyntaxTree.format <<~RUBY
  if a in Integer
    puts "a is integer"
  end

  b => [Integer => c]
RUBY

emits:

puts "a is integer" if a in Integer

b in [Integer => c]

---

However, as long as you don't use in earlier in scope, the b line correctly isn't modified

puts SyntaxTree.format "b => [Integer => c]"

emits

b => [Integer => c]

Happy to take a crack at fixing if you can point me in the right direction.

[kddnewton]

Thanks for the report! This was actually pretty in the weeds of how the parser works so I went ahead and fixed it myself. The PR is linked, and it'll be out in the next release.