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dearblue
2a1ea7d605
If `Class#allocate` is prohibited, subclasses should also be implicitly prohibited. ```ruby p Class.new(Struct).allocate.class # => #<Class:0x82362ac00> by #6122 # => allocator undefined for #<Class:0x000000083a983220> (TypeError) by Ruby 3.2 ``` Added `MRB_DEFINE_ALLOCATOR()` to allow subclasses to use `Class#allocate`. Supplement to #6122.