optimize(env): single arg

src/jit/helpers.rs

@@ -1,3 +1,5 @@
+use std::rc::Rc;
+
 use inkwell::AddressSpace;
 use inkwell::context::Context;
 use inkwell::execution_engine::ExecutionEngine;
@@ -205,7 +207,11 @@ extern "C" fn helper_debug(value: JITValue) {
 #[unsafe(no_mangle)]
 extern "C" fn helper_capture_env(thunk: JITValue, env: *const LetEnv) {
     let thunk: &Thunk = unsafe { std::mem::transmute(thunk.data.ptr.as_ref().unwrap()) };
-    thunk.capture(unsafe { env.as_ref().unwrap() }.clone());
+    let env = unsafe {
+        Rc::from_raw(env)
+    };
+    thunk.capture(env.clone());
+    std::mem::forget(env);
 }
 
 #[unsafe(no_mangle)]

src/jit/test.rs

@@ -32,7 +32,7 @@ fn test_expr(expr: &str, expected: Value) {
     );
     let env = env(&vm);
     let value = vm
-        .eval(prog.top_level.into_iter(), env)
+        .eval(prog.top_level.into_iter(), env.into())
         .unwrap()
         .to_public(&vm, &mut HashSet::new());
     assert_eq!(value, expected);