diff --git a/runtime/src/scm.rs b/runtime/src/scm.rs
index 1c39ca1..1528046 100644
--- a/runtime/src/scm.rs
+++ b/runtime/src/scm.rs
@@ -5,7 +5,7 @@ use std::slice;
 
 use internment::Intern;
 
-use crate::{gc};
+use crate::gc;
 
 pub type scm_bits = u64;
 
diff --git a/runtime/src/var.rs b/runtime/src/var.rs
index d9a6f7d..be2ba9c 100644
--- a/runtime/src/var.rs
+++ b/runtime/src/var.rs
@@ -1,26 +1,26 @@
 use std::{collections::HashMap, ops::DerefMut as _, sync::{LazyLock, RwLock}};
 use crate::scm::scm_bits;
 
-// struct Vars (
-//     LazyLock <RwLock <HashMap <SymbolU32, scm_bits>>>
-// );
+struct Vars (
+    LazyLock <RwLock <HashMap <String, scm_bits>>>
+);
 
-// impl Vars {
-//     pub const fn new () -> Vars {
-//         Vars (LazyLock::new (|| RwLock::new (HashMap::new ())))
-//     }
+impl Vars {
+    pub const fn new () -> Vars {
+        Vars (LazyLock::new (|| RwLock::new (HashMap::new ())))
+    }
 
-//     pub fn lookup (&self, name : SymbolU32) -> Option <scm_bits> {
-//         // let r = self.0.write ().unwrap ();
-//         // (*r).get (&name).map (|x| *x)
-//         todo! ()
-//     }
+    pub fn lookup (&self, name : String) -> Option <scm_bits> {
+        // let r = self.0.write ().unwrap ();
+        // (*r).get (&name).map (|x| *x)
+        todo! ()
+    }
 
-//     pub fn define (&self, name : SymbolU32, value : scm_bits) {
-//         // let mut r = self.0.write ().unwrap ();
-//         // r.deref_mut ().insert (name, value);
-//         todo! ()
-//     }
-// }
+    pub fn define (&self, name : String, value : scm_bits) {
+        // let mut r = self.0.write ().unwrap ();
+        // r.deref_mut ().insert (name, value);
+        todo! ()
+    }
+}
 
-// static vars : Vars = Vars::new (); 
+static vars : Vars = Vars::new ();