Larceny v0.98 "General Ripper" (Mar 7 2015 01:06:26, precise:Linux:unified)
larceny.heap, built on Sat Mar 7 01:06:50 EST 2015
> (define s "x\x130;")
> (string-titlecase s)
Error: string-set!: illegal second argument: -1 is not a valid index into string