ostruct super regression
In ruby 3.0, Calling super on ostruct always returns nil. This is a regression in ruby 3.0 introduced when fixing another issue.
This unintentionally changed
super behavior in classes that inherit from OpenStruct.
require 'ostruct' class Foo < OpenStruct def foo super end end p Foo.new(foo: 123).foo
Ruby 3.0: => nil Ruby 2.7: => 123
Potential fix is to bring back some of the behavior reverted in issue #12136 to allow method missing to sometimes respond to methods with zero arguments.
This is implemented in: https://github.com/ruby/ruby/pull/4028 and included as a patch attached to this issue.