Is there a way to do dynamic code generation in Rust ?
Here is the problem I am facing:

The user types in a simple math equation (like in a graphing calculator).

My program parses the expression into an abstract syntax tree.

I need to evaluate the function on a 1000x1000 grid  1,000,000 points.
Now, in a dumb implementation, we do something like:
for x in 0..1000
for y in 0..1000
let z = eval_ast(parsed_formula, x, y)
the problem here is that every evaluation of every point requires traversing the entire parsed formula  which contains lots of Rc/Box ... and jumping around in memory.
Now, what I would like to do is to do some type of dynamic code generation, to compile "parsed formula" down to a C function that we can call, something like:
let c_func = do_magic_dynamic_code_generation(parsed_formula);
for x in 0..1000
for y in 0..1000
let z = c_func(x, y)
Is there a way to do this in Rust? (perferably with wasm32 support  but even if not, I would like to hear about it).