`freeze` does not freeze `singleton_class`

[marcandre]

o = Object.new
o.singleton_class # needed for bug
o.freeze
def o.foo
  42
end # => succeeds, should raise `FrozenError`
p o.foo # => 42

Note that calling singleton_class is necessary to create the bug, I presume because it forces the creation of the singleton_class before freezing.

$ ruby -v
truffleruby 20.3.0-dev-80339253, like ruby 2.6.6, GraalVM CE Native [x86_64-darwin]

[chrisseaton]

Thanks that's an interesting bug. We should be ale to spec and fix this. Does it come from some wider code you're able to share?

[marcandre]

Found when working on ostruct: ruby/ostruct@0adb58d (had to disable a test, search for truffle)

[bjfish]

Thanks, this is now fixed at: 3d1e64a.