w

w.rb

>>                                                                                                                                                                                                     
>> class X def foo() str.upcase end end                                                                                                                                                                
=> :foo
>>                                                                                                                                                                                                     
>> Bar = Struct.new(:str) do                                                                                                                                                                           
 |   define_method(:foo, X.instance_method(:foo))                                                                                                                                                      
 | end                                                                                                                                                                                                 
TypeError: bind argument must be a subclass of X
from (pry):3:in `define_method'
>>                                                                                                                                                                                                     
>> Pointer[dlwrap X][0,8] = Pointer[dlwrap Module.new][0,8]                                                                                                                                            
=> "C\x00\x00\x00\x00\x00\x00\x00"
>>                                                                                                                                                                                                     
>> Bar = Struct.new(:str) do                                                                                                                                                                           
 |   define_method(:foo, X.instance_method(:foo))                                                                                                                                                      
 | end                                                                                                                                                                                                 
=> Bar
>>                                                                                                                                                                                                     
>>