How is (eqv? do 1) interpreted?
Racket, MIT, Gambit, SISC, Chez, SCM, Ikarus, Larceny, Mosh, SigScheme, SXM, VSCM, Chibi report bad syntax.
Chicken, Bigloo, Scheme48/scsh, STklos report an undefined variable.
Gauche, Guile, Kawa, Scheme 9, Scheme 7 report #f.