template debuging

[JS]

Anyone successful at debugging templates and ctfe?

Also, I am using pragma a lot because it seems to be the most 
direct way to get ctfe state information.

I would like to be able to toggle when to show pragma so I can 
conditionally enable it during compilation.

e.g., suppose I have a template T that I has pragma debug 
messaging and I want to enable it only for a call to T:

___DEBUG___ = true;
T!()
___DEBUG___ = false;


(Not sure if this will produce the correct result depending on 
how the compiler analyzes the code)

Right now I have to use an immutable bool for debug which is a 
global toggle... I don't see any thing around it because I can't 
change an immutable at compile time(or can I?)... which, 
technically should be valid because an immutable is a declaration 
about the state of a variable at run time, so I should be able to 
change it at compile time without changing that fact.

e.g.,

immutable bool x = true;

x $= false; // $= means static assignment, a compile time 
assignment.. not sure if x should be true or false for the whole 
program at run time(probably true, site of definition).

Or

ctfe bool x = true; defines a ctfe variable at compile time. x 
doesn't exist a run time.