diff --git a/src/process.rs b/src/process.rs
index 8a9cf7d..9a17888 100644
--- a/src/process.rs
+++ b/src/process.rs
@@ -312,9 +312,8 @@ impl<'src> Process<'src> {
 
     pub fn eval(&mut self) -> LResult<'src> {
         use Ast::*;
-        let root_node = self.ast;
-        let root_span = self.span;
-        let result = match self.ast {
+        let (root_node, root_span) = (self.ast, self.span);
+        let result = match root_node {
             Nil => Ok(Value::Nil),
             Boolean(b) => Ok(Value::Boolean(*b)),
             Number(n) => Ok(Value::Number(*n)),