once_cell | Rust library for single assignment cells

Reqwest lists OpenSSL as a requirement on Linux due to it using native-tls, which depends on openssl. You need to install the pkg-config and libssl-dev packages:

The problem is quite clear:

Your Rust target architecture (64-bit) does not match your python interpreter (32-bit)

Either upgrade your Python interpreter to 64 bit, or use rustup to install a 32 bit Rust target

Edit: Here is how you could manually target 32 bit on a x86_64 machine

You were close with adding Sync. If you look closely you'll see that the error then recommends adding Send:

Whether cargo test spins up a new thread per test or not is actually irrelevant.

A static variable is global, and thus potentially shared between threads, thus even if no thread is ever spawned, it must be Sync.

And since Rc is not Sync (cannot be shared between threads), this cannot work.

There is one thread_local! variable per thread, as the name suggests.

The code within thread_local! is actually not run immediately upon thread-creation; as the variable is lazily instantiated on first access.

Don't use the output of pest directly.

If you post-process the output of pest and create a structure that is Sync out of it, then you can store it with lazy_static and it will only be parsed once.

Actually, you could go further and avoid lazy_static entirely. If you can express the structure in a purely const way, then you could use a build.rs script or procedural macro to transform the string into a model at compile-time. For tests, though, this may not be worth the effort.