feat: recursive builtins

src/ty/internal/func.rs

@@ -2,7 +2,7 @@ use ecow::EcoString;
 use itertools::Itertools;
 use rpds::HashTrieMap;
 
-use crate::bytecode::{OpCodes, ThunkIdx};
+use crate::bytecode::OpCodes;
 use crate::ty::internal::{Thunk, Value};
 
 use crate::vm::{CapturedEnv, VM};
@@ -11,7 +11,7 @@ use crate::vm::{CapturedEnv, VM};
 pub enum Param {
     Ident(EcoString),
     Formals {
-        formals: Vec<(EcoString, Option<ThunkIdx>)>,
+        formals: Vec<(EcoString, Option<Thunk>)>,
         ellipsis: bool,
         alias: Option<EcoString>,
     },
@@ -60,7 +60,7 @@ impl Func {
                 for (formal, default) in formals {
                     let arg = arg
                         .select(formal.clone().into())
-                        .or_else(|| default.map(|idx| Value::Thunk(Thunk(idx))))
+                        .or_else(|| default.map(|thunk| Value::Thunk(thunk)))
                         .unwrap();
                     new.insert_mut(formal.into(), arg);
                 }
@@ -89,7 +89,7 @@ impl Func {
         formals.push((param, None));
     }
 
-    pub fn push_default_param(&mut self, default: ThunkIdx) {
+    pub fn push_default_param(&mut self, default: Thunk) {
         let Param::Formals { formals, .. } = self.param.as_mut().unwrap() else {
             panic!()
         };