On the page 57 you show pcg_rand = "0.13" as a search result for the PCG algo, but later use rand_pcg on the page 58. Which are two different libraries (with latter being newer).

As it’s never actually shown what gets added to the workspace’s Cargo.toml (it’s only sort of implied reader should do that, jumping immediately to .workspace = true for the library) - it is not entirely clear which one should be used, and if rand_pcg - which version.

I assume rand_pcg = "0.9" is the one that is meant to be used (January of 2025), as the pxg_rand one doesn’t have the Pcg64Mcg type