Bug #21265: Crash when proc from Symbol#to_proc called outside refinement scope

• Status: Open
• Assignee: -
• Target version: -
• ruby -v: ruby 3.4.2 and trunk
• Backport: 3.2: DONTNEED, 3.3: DONTNEED, 3.4: REQUIRED

[alanwu (Alan Wu)]

class RefinedScope
  using(Module.new { refine(Kernel) { def itself = 0 } })
  ITSELF = :itself.to_proc
end

RefinedScope::ITSELF[0]

../vm_method.c:1371: Assertion Failed: prepare_callable_method_entry:RB_TYPE_2_P(defined_class, RUBY_T_ICLASS, RUBY_T_MODULE): defined_class: T_FALSE

Or SEGV without -DRUBY_DEBUG.