rust: add step6_file

1 files changed, 9 insertions, 1 deletions

diff --git a/rust/src/env.rs b/rust/src/env.rs
index 1471d20..3c98015 100644
--- a/rust/src/env.rs
+++ b/rust/src/env.rs
@@ -73,6 +73,14 @@ pub fn env_find(env: Env, key: String) -> Option<Env> {
 }
 
 #[allow(dead_code)]
+pub fn env_root(env: &Env) -> Env {
+    match env.borrow().outer {
+        Some(ref ei) => env_root(ei),
+        None => env.clone(),
+    }
+}
+
+#[allow(dead_code)]
 pub fn env_set(env: &Env, key: String, val: MalVal) {
     env.borrow_mut().data.insert(key, val.clone());
 }
@@ -86,7 +94,7 @@ pub fn env_get(env: Env, key: String) -> MalRet {
                 None => Ok(Rc::new(Nil)),
             }
         },
-        None    => Ok(Rc::new(Nil)),
+        None    => Err("'".to_string() + key + "' not found".to_string()),
     }
 }