Many examples out there are broken. As a sidenote, I've been benchmarking Zig, Rust and C++ with a fibonacci benchmark and the results basically show that C++ is the fastest, but within a 3% margin of error against Rust and Zig, which are mostly similar (Rust so ever slightly faster).

Will Github ever fix their Zig syntax highlighting so it's not all brown text by default?

I mean it’s a random repo, what do you expect from the Zig authors?