Issue #2419 has been updated by ujihisa ..

Status changed from Open to Assigned
Assigned to set to Nobuyoshi Nakada

FYI: In my environment, the latter result was different.

ruby 1.9.2dev (2009-11-30 trunk 25961) [i386-darwin9.8.0]
C
/var/folders/Dz/Dz5WpFSZGUaFLA8jp8kT5E+++TM/-Tmp-/v408625/85:12:in `block in <class:C>': super: no superclass method `remove_const' for C:Class (NoMethodError)
	from /var/folders/Dz/Dz5WpFSZGUaFLA8jp8kT5E+++TM/-Tmp-/v408625/85:17:in `call'
	from /var/folders/Dz/Dz5WpFSZGUaFLA8jp8kT5E+++TM/-Tmp-/v408625/85:17:in `<class:C>'
	from /var/folders/Dz/Dz5WpFSZGUaFLA8jp8kT5E+++TM/-Tmp-/v408625/85:9:in `<main>'

(Please ignore the difference of line numbers)
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http://redmine.ruby-lang.org/issues/show/2419

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http://redmine.ruby-lang.org