rbs prototype rb fails due to syntax error

[sinsoku]

Description

We often create template files in *.rb.
The rbs prototype command will fail on the directory containing these files.

Steps to reproduce

It fails because devise has template files that uses ERB in *.rb.

$ git clone --depth 1 https://github.com/heartcombo/devise.git
$ cd devise
$ rbs prototype rb --out-dir=sig/prototype --base-dir=. lib
Processing `lib`...
  Generating RBS for `lib/generators/active_record/devise_generator.rb`...
    - Writing RBS to `sig/prototype/lib/generators/active_record/devise_generator.rbs`...
  Generating RBS for `lib/generators/active_record/templates/migration.rb`...
<internal:ast>:59:in `parse': syntax error, unexpected local variable or method, expecting ';' or '\n' (SyntaxError)
...:Migration<%= migration_version %>
...              ^~~~~~~~~~~~~~~~~
syntax error, unexpected operator-assignment, expecting `end' or dummy end
    create_table :<%= table_name %><%= primary_key...
                   ^~
syntax error, unexpected operator-assignment, expecting `end' or dummy end
    add_index :<%= table_name %>, :reset_passwo...
                ^~
syntax error, unexpected `end'
	from /Users/sinsoku/.rbenv/versions/3.2.2/lib/ruby/gems/3.2.0/gems/rbs-3.1.3/lib/rbs/prototype/rb.rb:97:in `parse'
	from /Users/sinsoku/.rbenv/versions/3.2.2/lib/ruby/gems/3.2.0/gems/rbs-3.1.3/lib/rbs/cli.rb:823:in `block (2 levels) in run_prototype_file'
	from /Users/sinsoku/.rbenv/versions/3.2.2/lib/ruby/gems/3.2.0/gems/rbs-3.1.3/lib/rbs/cli.rb:793:in `each'
	from /Users/sinsoku/.rbenv/versions/3.2.2/lib/ruby/gems/3.2.0/gems/rbs-3.1.3/lib/rbs/cli.rb:793:in `block in run_prototype_file'
	from /Users/sinsoku/.rbenv/versions/3.2.2/lib/ruby/gems/3.2.0/gems/rbs-3.1.3/lib/rbs/cli.rb:784:in `each'
	from /Users/sinsoku/.rbenv/versions/3.2.2/lib/ruby/gems/3.2.0/gems/rbs-3.1.3/lib/rbs/cli.rb:784:in `run_prototype_file'
	from /Users/sinsoku/.rbenv/versions/3.2.2/lib/ruby/gems/3.2.0/gems/rbs-3.1.3/lib/rbs/cli.rb:642:in `run_prototype'
	from /Users/sinsoku/.rbenv/versions/3.2.2/lib/ruby/gems/3.2.0/gems/rbs-3.1.3/lib/rbs/cli.rb:137:in `run'
	from /Users/sinsoku/.rbenv/versions/3.2.2/lib/ruby/gems/3.2.0/gems/rbs-3.1.3/exe/rbs:7:in `<top (required)>'
	from /Users/sinsoku/.rbenv/versions/3.2.2/bin/rbs:25:in `load'
	from /Users/sinsoku/.rbenv/versions/3.2.2/bin/rbs:25:in `<main>'

System configuration

$ ruby --version
ruby 3.2.2 (2023-03-30 revision e51014f9c0) [arm64-darwin22]

$ rbs --version
rbs 3.1.3