Add eval in env + env/create, env/load-prelude

src/vm/prelude/mod.rs

@@ -1,3 +1,5 @@
+use std::rc::Rc;
+
 use crate::vm::env::Environment;
 
 mod collections;
@@ -10,7 +12,7 @@ mod math;
 
 pub(crate) use math::*;
 
-pub fn load(env: &Environment) {
+pub fn load(env: &Rc<Environment>) {
     math::load(env);
     eval::load(env);
     functional::load(env);