Lexer and parser generators using CTFE

[d coder]

>
>
> This sounds like something I ran into in my D lexer project. Lexing
> Phobos took upwards of 10-15 seconds, which is extremely slow
> considering that dmd can *compile* it in just a few seconds. So I did
> some profiling, and found out that most of the time was spent formatting
> tokens into strings and running writeln. After I commented that out, the
> running time dropped to just a few seconds. :-)
>
>
And how different was just a few seconds from 10-15 seconds? :-)
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