Disallow side effects in assert

[Daniel Murphy]

"bearophile"  wrote in message news:aifyouczfuqhdgubpfsw at forum.dlang.org...

> How many impure functions do you call in your asserts?
> In D we have a purity system, and now it works well enough. It's a good 
> idea to actually start use it, for asserts, contracts, parallelism, etc.

Do you really want to force all codebases to 'pure'ify all their functions? 
A function call in an assert might be a red flag, but it certainly isn't a 
bug.