Fix (ArgumentError) invalid byte sequence in UTF-8

[ksss]

I exec $ rb prototype rb on the following file and found the problem.

https://github.com/rails/rails/blob/b5630e232b95859c4171a285cd8f130e37d3c501/activesupport/lib/active_support/core_ext/digest/uuid.rb

$ rbs prototype rb activesupport/lib/active_support/core_ext/digest/uuid.rb
/Users/ksss/.rbenv/versions/3.1.1/lib/ruby/gems/3.1.0/gems/rbs-2.4.0/lib/rbs/prototype/rb.rb:488:in `match?': invalid byte sequence in UTF-8 (ArgumentError)
	from /Users/ksss/.rbenv/versions/3.1.1/lib/ruby/gems/3.1.0/gems/rbs-2.4.0/lib/rbs/prototype/rb.rb:488:in `literal_to_type'
	from /Users/ksss/.rbenv/versions/3.1.1/lib/ruby/gems/3.1.0/gems/rbs-2.4.0/lib/rbs/prototype/rb.rb:341:in `process'
	from /Users/ksss/.rbenv/versions/3.1.1/lib/ruby/gems/3.1.0/gems/rbs-2.4.0/lib/rbs/prototype/rb.rb:357:in `block in process_children'
	from /Users/ksss/.rbenv/versions/3.1.1/lib/ruby/gems/3.1.0/gems/rbs-2.4.0/lib/rbs/prototype/helpers.rb:74:in `block in each_node'
	from /Users/ksss/.rbenv/versions/3.1.1/lib/ruby/gems/3.1.0/gems/rbs-2.4.0/lib/rbs/prototype/helpers.rb:72:in `each'
	from /Users/ksss/.rbenv/versions/3.1.1/lib/ruby/gems/3.1.0/gems/rbs-2.4.0/lib/rbs/prototype/helpers.rb:72:in `each_node'
	from /Users/ksss/.rbenv/versions/3.1.1/lib/ruby/gems/3.1.0/gems/rbs-2.4.0/lib/rbs/prototype/helpers.rb:68:in `each_child'
	from /Users/ksss/.rbenv/versions/3.1.1/lib/ruby/gems/3.1.0/gems/rbs-2.4.0/lib/rbs/prototype/rb.rb:356:in `process_children'
	from /Users/ksss/.rbenv/versions/3.1.1/lib/ruby/gems/3.1.0/gems/rbs-2.4.0/lib/rbs/prototype/rb.rb:351:in `process'

I suggest using String#ascii_only? since the original Regexp(/\A[ -~]+\z/) seemed to be determining if it was an ascii string only.

As a side effect, strings like "" and "foo\nbar", which were not previously converted as literals, are now recognized as literals.

[soutaro]

👍