Blankslate Ruby 3.0 compatibility

[voxik]

Testing with Ruby 3.0, I observe the following error:

$ ruby -Ilib:test -e 'Dir.glob "./test/test_blan*.rb", &method(:require)' -- -n /test_late_included_module_in_kernel_is_ok/
Run options: -n /test_late_included_module_in_kernel_is_ok/ --seed 30445

# Running:

F

Finished in 0.000934s, 1070.2879 runs/s, 1070.2879 assertions/s.

  1) Failure:
TestBlankSlate#test_late_included_module_in_kernel_is_ok [/builddir/build/BUILD/builder-3.2.4/usr/share/gems/gems/builder-3.2.4/test/test_blankslate.rb:149]:
NoMethodError expected but nothing was raised.

1 runs, 1 assertions, 1 failures, 0 errors, 0 skips

[voxik]

I think this is probably related to the ruby-core#9573 and this fixes the test case:

$ git diff
diff --git a/lib/blankslate.rb b/lib/blankslate.rb
index 7ea1864..b974f40 100644
--- a/lib/blankslate.rb
+++ b/lib/blankslate.rb
@@ -129,7 +129,7 @@ class Module
   alias blankslate_original_append_features append_features
   def append_features(mod)
     result = blankslate_original_append_features(mod)
-    return result if mod != Object
+    return result if (mod != Object && mod != Kernel)
     instance_methods.each do |name|
       BlankSlate.hide(name)
     end

However, I am not quite sure this is the right fix.

[byroot]

Fixed in #15