help function displays values not

Signed-off-by: Ava Hahn <ava@aidanis.online>

src/sym.rs

@@ -222,6 +222,23 @@ impl fmt::Display for Args {
     }
 }
 
+impl fmt::Display for ValueType {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            ValueType::VarForm(ref s) => write!(f, "{}", s),
+            ValueType::Internal(_) => write!(f, "<builtin>"),
+            ValueType::FuncForm(ref form) => {
+                write!(f, "args: ")?;
+                for sym in form.arg_syms.clone() {
+                    write!(f, "{} ", sym)?;
+                }
+                write!(f, "\nform: {}", form.ast)?;
+                Ok(())
+            },
+        }
+    }
+}
+
 impl Symbol {
     /* call
      * routine is called by eval when a symbol is expanded