interpret loop & recur

src/main.rs

@@ -27,7 +27,7 @@
 //     * [x] `as` patterns
 //     * [x] splat patterns in tuples, lists, dicts
 //     * [x] splats in list and dict literals
-//     * [ ] `loop` and `recur`
+//     * [x] `loop` and `recur`
 //     * [ ] string patterns
 //     * [ ] string interpolation
 // * [~] write `base` in Rust
@@ -57,10 +57,10 @@ use crate::base::*;
 
 pub fn main() {
     let src = "
-let foo = :foo
+let foo = false
 loop (foo) with {
     (:foo) -> :done
-    (x as :bool) -> recur (:bar)
+    (x as :boolean) -> recur (:bar)
     (x as :number) -> recur (:foo) 
     (x as :keyword) -> recur (:foo)
 }

src/value.rs

@@ -142,6 +142,7 @@ impl<'src> Value<'src> {
             Value::Placeholder => unreachable!(),
             Value::Args(_) => unreachable!(),
             Value::Base(_) => Value::Keyword("fn"),
+            Value::Recur(..) => unreachable!(),
         }
     }
 }