This is one of the things that allow the "comptime language" to just be Zig, as in this example: https://ziglang.org/documentation/master/#Case-Study-print-i...
Anyway, I found this article that concludes that D's compile time evaluation is equivalent in power to Zig's, although it also doesn't cover how comptime variables can be used in Zig: https://renato.athaydes.com/posts/comptime-programming
However, as I've said many times, knowing about the theoretical power of partial evaluation, what excites me in Zig isn't what comptime can do (although I am impressed with the syntactic elegance of the mechanism) but how it is used to avoid adding other features.
A phone with a touchscreen is evolutionary; a phone without a keypad is revolutionary. The revolution is in the unique experience of using "just comptime" for many things.
It is, of course, a tradeoff, and whether or not that tradeoff is "good" remains to be seen, but I think this design is one of the most novel designs in programming languages in many, many years.