Sorry for spamming.
And probably, 'unquote' and 'unquote-splicing' should also be exported from (scheme r5rs) 
library. I'm
 not sure exact definition of them on R5RS but R7RS auxiliary syntaxes should be
exported otherwise it is an error.
Cheers,
_/_/
Takashi Kato
Email: ktakashi@x
 
     On Wednesday, 15 October 2014, 14:10, Takashi Kato <ktakashi@x> wrote:
  
   Hi,
I've just found  (scheme r5rs) on Appendix A. Standard Libraries doesn't
 
export 'else' syntax and it should be otherwise cond _expression_ with else
 clause would be an error.
Cheers,
_/_/
Takashi Kato
Email: ktakashi@x