[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_object.rb b/test/ruby/test_object.rb
index 774b707742..83208bbcdb 100644
--- a/test/ruby/test_object.rb
+++ b/test/ruby/test_object.rb
@@ -777,7 +777,7 @@ class TestObject < Test::Unit::TestCase
     e = assert_raise(NoMethodError) {
       o.never_defined_test_no_superclass_method
     }
-    assert_equal(m1, e.message, bug2312)
+    assert_equal(m1.lines.first, e.message.lines.first, bug2312)
   end
 
   def test_superclass_method