Immutable strings

This is an attempt to determine which Schemes treat literal strings as immutable, using the code

(define y "abcde")
(string-set! y 0 #\c)
y

Mutates y to the value "cbcde": MIT, Gambit, Chicken, Bigloo, Detroit, Stalin, Scheme->C, SCM, Chez, Vicare, Larceny, Ypsilon, JScheme, RScheme, S7, Unlikely, BDC, XLisp, UMB, Elk, SXM, Inlab, Foment, Picrin, Chibi

Raises an error about mutating an immutable object: Racket, Gauche, Scheme48/scsh, Guile, Kawa, SISC, Mosh, IronScheme, STklos, KSi, SigScheme, TinyScheme, Scheme 9, Sizzle, Sagittarius

Does not support string-set!: NexJ, Shoe, Rep, Llava, FemtoLisp, Dfsch, Owl Lisp (no mutation)

Does not support #\c: MiniScheme, SIOD, Schemik

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