Clean up more RebindableSyntax crud in error messages.
Clean up more RebindableSyntax crud in error messages.

parvmor/codeworld,three/codeworld,nomeata/codeworld,stefan-j/codeworld,nomeata/codeworld,alphalambda/codeworld,parvmor/codeworld,venkat24/codeworld,stefan-j/codeworld,nomeata/codeworld,tgdavies/codeworld,tgdavies/codeworld,google/codeworld,google/codeworld,alphalambda/codeworld,pranjaltale16/codeworld,pranjaltale16/codeworld,three/codeworld,pranjaltale16/codeworld,stefan-j/codeworld,three/codeworld,tgdavies/codeworld,google/codeworld,venkat24/codeworld,parvmor/codeworld,alphalambda/codeworld,venkat24/codeworld