> Zig’s “No host leakage” (to guarantee cross-compile-ability) looks like the one possibly substantively different thing.
That is a good idea, but could be problematic if one relies on size_t, which changes in size from 32 to 64 bit. D's CTFE adds checks for undefined behavior, such as shifting by more bits than are in the type being shifted. These checks are not done at runtime for performance reasons.
D's CTFE also does not allow calling the operating system, and only works on functions that are "pure".
Because Zig supports cross-compilation, what you care about isn't the host -- the machine that runs the compiler -- but the target, which is not (necessarily) the same as the host. While information about the host isn't made available, information about the compilation target is: https://ziglang.org/documentation/master/#Compile-Variables
That is a good idea, but could be problematic if one relies on size_t, which changes in size from 32 to 64 bit. D's CTFE adds checks for undefined behavior, such as shifting by more bits than are in the type being shifted. These checks are not done at runtime for performance reasons.
D's CTFE also does not allow calling the operating system, and only works on functions that are "pure".