id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	difficulty
869	xsubstring with negative `from' argument returns empty string	Mario Domenech Goulart		"The reference implementation of SRFI-13 gives an example of {{{xsubstring}}} with a negative {{{from}}} argument:

{{{
(xsubstring ""abcdef"" -2) => ""efabcd""
}}}

In chicken:

{{{
$ csi -nq -R srfi-13
#;1> (xsubstring ""abcdef"" -2)
""""
}}}

Gauche and Guile produce {{{""efabcd""}}} (they don't seem to use the SRFI-13 reference implementation code).
"	defect	closed	major		core libraries	4.7.x	fixed	srfi-13, xsubstring