[racket-dev] . . for-each: arity mismatch for procedure

At Thu, 7 Apr 2011 12:05:01 -0600, Matthew Flatt wrote:
> At Thu, 7 Apr 2011 13:29:10 -0400, Matthias Felleisen wrote:
> > I suspect that this is a bug 
> > in arity checking/reporting (at Matthew's level). 
> 
> Me too, since I changed something related, but I haven't been able to
> replicate the problem so far. Let me know if you can.

Fixed. It was an arity-reporting bug, but not as new as I thought. The
key ingredients were `for-each' and a chaperoned (via a contract)
procedure.