id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	difficulty
925	Tests for smtp and internet-message eggs start breaking on 2012-09-19	Mario Domenech Goulart		"See http://tests.call-cc.org/master/linux/x86/2012/09/19/yesterday-diff/log2/test/smtp.html and http://tests.call-cc.org/master/linux/x86/2012/09/19/yesterday-diff/log2/test/internet-message.html for the full error messages.

Both tests show a similar error message:

{{{
Error: (map) bad argument type - not a list: #<char-set>
}}}

None of those eggs were modified at the period the errors occur.  The core changes were {{{0f6cef9..8d409f9}}}.  The core changes correspond to irregex update patches, but the eggs don't use the irregex unit, as far as I can see.
"	defect	closed	major	someday	unknown	4.8.x	fixed		Ivan Raikov