From: "hurricup (Alexandr Evstigneev) via ruby-core" <ruby-core@...>
Date: 2023-03-27T05:54:53+00:00
Subject: [ruby-core:113022] [Ruby master Bug#19548] Ambiguous and confusing syntax for alias/undef arguments

Issue #19548 has been reported by hurricup (Alexandr Evstigneev).

----------------------------------------
Bug #19548: Ambiguous and confusing syntax for alias/undef arguments
https://bugs.ruby-lang.org/issues/19548

* Author: hurricup (Alexandr Evstigneev)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
This was introduced in https://bugs.ruby-lang.org/issues/8851 and looks really confusing at least because of bare `/`. 
Here are 3 semantically similar methods, but feels like first two should not be valid:
```
def method1
  undef :*,<<,/,[]
  alias :* /
end

def method2
  undef :*,
    <<,
    /,
    []
  alias :*
  /
end

def method3
  undef :*
  undef :<<
  undef :/
  undef :[]
  alias :* :/
end

puts RubyVM::InstructionSequence.of(method :method1).disasm
puts RubyVM::InstructionSequence.of(method :method2).disasm
puts RubyVM::InstructionSequence.of(method :method3).disasm
```



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