Issue #578 has been updated by Marc-Andre Lafortune.

Category set to core
Status changed from Closed to Open
Target version changed from 1.9.x to 1.9.2

I didn't check the code, but isn't it supposed to make the following work?

$ rubydev -e 'RubyVM::InstructionSequence.disassemble(Proc.new{40+2})'
-e:1:in `disassemble': wrong argument type proc (expected method) (TypeError)
	from -e:1:in `<main>'

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http://redmine.ruby-lang.org/issues/show/578

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