From: "tompng (tomoya ishida) via ruby-core" <ruby-core@...>
Date: 2024-07-16T12:38:34+00:00
Subject: [ruby-core:118618] [Ruby master Bug#20637] SyntaxError class definition in method body can be bypassed

Issue #20637 has been updated by tompng (tomoya ishida).


dynamic constant assignment (SyntaxError) can be also bypassed
~~~ruby
def f
  class << Object.new
    ::A = 1
  end
end
~~~


----------------------------------------
Bug #20637: SyntaxError class definition in method body can be bypassed
https://bugs.ruby-lang.org/issues/20637#change-109146

* Author: tompng (tomoya ishida)
* Status: Open
* ruby -v: ruby 3.4.0dev (2024-07-11T06:59:45Z master a1f7432550) [x86_64-linux]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
Class definition in method body is prohibited in Ruby
~~~ruby
def f
  class ::A; end # class definition in method body (SyntaxError)
  module B; end # module definition in method body (SyntaxError)
end
~~~

But it can be bypassed by using `class <<`
~~~ruby
def f
  class << Object.new
    class ::A; end # Syntax OK
    module B; end # Syntax OK
  end
end
~~~



-- 
https://bugs.ruby-lang.org/
 ______________________________________________
 ruby-core mailing list -- ruby-core@ml.ruby-lang.org
 To unsubscribe send an email to ruby-core-leave@ml.ruby-lang.org
 ruby-core info -- https://ml.ruby-lang.org/mailman3/lists/ruby-core.ml.ruby-lang.org/