Time for Phobos CTFE-ability unittests...right? RIGHT?

[Trass3r]

I totally agree.

At least simple functions like string manipulation need to be available at  
compile-time to use string mixins properly.

2.051 broke replace(), then it was fixed.
2.052 broke it again by moving it into std.array and changing the  
implementation.
Now with 2.054 toUpper() is broken.

If you have a library that extensively uses CTFE this is a major problem.