Implement JWT authentication and secure password hashing in FastAPI using PyJWT and pwdlib with Argon2. Complete code examples for login, token generation, and user verification.

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parasyte: > I think I have filled in the gaps enough to reproduce the error There is a link in the OP to the fullcode. parasyte: > The compiler finds that the only suitable lifetime for `'_` in `FnMut(&mut S::Product<'_>)` is `'static`. To fix this, we can constrain the lifetime explicitly, chosen by the caller: This is what I understand too and also the solution I use. But my point here is to understand why is `'static` required will it seems it shouldn't. parasyte: > There are some other unusual things about this code. Well, this is a minimal version of one of my project. The technical choices depend of the rest of the project. The point of my post is to understand why the compiler have those limitations and how to workaround them.