for in D versus C and C++

[Walter Bright]

Sean Kelly wrote:
> I've found that once I created one lexer it could be re-used pretty 
> easily for other languages too.  And recursive descent parsers are 
> trivial to write.  It may be overkill for command-line parameters, but 
> for anything remotely structured it's generally worth using.

When I was looking into parsing date strings, I thought it would be much 
easier if I adopted a lex/parse style approach. The result is in 
std.dateparse. The payoff is I've had very little trouble with it.