[WIP] add error_squiggle gem

```
$ ./local/bin/ruby -e '1.time {}'
-e:1:in `<main>': undefined method `time' for 1:Integer (NoMethodError)

1.time {}
 ^^^^^
Did you mean?  times
```

https://bugs.ruby-lang.org/issues/17930

1 files changed, 1 insertions, 1 deletions

diff --git a/test/ruby/test_module.rb b/test/ruby/test_module.rb
index 84e74693aa..3411c3d701 100644
--- a/test/ruby/test_module.rb
+++ b/test/ruby/test_module.rb
@@ -267,7 +267,7 @@ class TestModule < Test::Unit::TestCase
     ].each do |name, msg|
       expected = "wrong constant name %s" % name
       msg = "#{msg}#{': ' if msg}wrong constant name #{name.dump}"
-      assert_raise_with_message(NameError, expected, "#{msg} to #{m}") do
+      assert_raise_with_message(NameError, Regexp.compile(Regexp.quote(expected)), "#{msg} to #{m}") do
         yield name
       end
     end