As tewtzel59 said, Nim usually compiles to C (and I guess that's what most people who program in Nim use). Even if modules were to be added to C, it wouldn't happen before 2022[[1](http://www.open-std.org/JTC1/SC22/WG14/www/docs/n2086.htm)], which is when the new standard will probably be published. And even then, you'd have to wait until the major compilers implement the feature.
You probably already know this, but if you want to speed up compile times you can use [tcc](https://en.wikipedia.org/wiki/Tiny_C_Compiler), which compiles 20x faster (!!!) than gcc and clang. Simply add --cc:tcc to the compiler invocation. Just be sure to switch back to gcc/clang for your release build.
