How to create a memory region at compile time and have part of it embedded in the program binary?

[squeek502]

More context here:

Comptime-Mutable Memory Changes

Hi everyone! Recently, PR #19414 was merged, which more-or-less rewrote the compiler’s internal implementation of comptime var. This rewrite comes with some language changes, so I thought I’d explain the user-facing impact of this PR here so that people know what’s going on when they inevitably get errors TL;DR A pointer to a comptime var is never allowed to become runtime-known, to be contained within the resolved value of a declaration, or to be otherwise referenced by analysis of any declara…