From: "jeremyevans0 (Jeremy Evans) via ruby-core" <ruby-core@...>
Date: 2024-09-06T03:32:49+00:00
Subject: [ruby-core:119078] [Ruby master Bug#20716] Different instance_method behavior in Ruby 2.7 and Ruby 3.x

Issue #20716 has been updated by jeremyevans0 (Jeremy Evans).


This appears to be a method caching bug in `super`.  If you remove the `.call(1)`, then it works correctly.  `super_method` returns the correct method.  The `define_method(:test, a)` call should result in the method cache being cleared or ignored, but it doesn't.  However, it isn't specific to `define_method`, regular `def` results in the same behavior.

Maybe related? commit:b9007b6c548f91e88fd3f2ffa23de740431fa969

----------------------------------------
Bug #20716: Different instance_method behavior in Ruby 2.7 and Ruby 3.x
https://bugs.ruby-lang.org/issues/20716#change-109662

* Author: natton (Tien Truong)
* Status: Open
* ruby -v: 3.3.1
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
Hi, I am working on upgrading our project from 2.7 to 3.x and found a breaking change in `instance_method` behavior.
Here is the code snippet
```
module A
  def test(*args)
    super
  end
end

module B
  def test(a)
    puts a
  end
end

B.prepend(A)

a = lambda do
  puts 'lambda'
end

class C
  include B
end

B.instance_method(:test).bind(C.new).call(1)
# Ruby 2.7: 1
# Ruby 3.0: 1
# Ruby 3.1: 1

B.module_exec do
  define_method(:test, a)
end

B.instance_method(:test).bind(C.new).call
# Ruby 2.7: lambda
# Ruby 3.0: wrong number of arguments (given 0, expected 1) (ArgumentError)
# Ruby 3.1: wrong number of arguments (given 0, expected 1) (ArgumentError)
```
I don't know if this is a bug or a correct intention.

My specs:
- Ruby manager: rbenv
- Tested on 
    - ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x86_64-linux]
    - ruby 3.0.7p220 (2024-04-23 revision 724a071175) [x86_64-linux]
    - ruby 3.1.4p223 (2023-03-30 revision 957bb7cb81) [x86_64-linux]
    - ruby 3.2.3 (2024-01-18 revision 52bb2ac0a6) [x86_64-linux]
    - ruby 3.3.1 (2024-04-23 revision c56cd86388) [x86_64-linux]





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