use new error kinds; track Environment nesting with stack

1 files changed, 3 insertions, 3 deletions

diff --git a/src/lisp/number.rs b/src/lisp/number.rs
index 18a41f7..23d7997 100644
--- a/src/lisp/number.rs
+++ b/src/lisp/number.rs
@@ -1,9 +1,9 @@
 use std::{
     fmt,
-    ops::{Add, Div, Mul, Sub},
+    ops::{Add, Mul, Sub},
 };
 
-use crate::lisp::error::LispError;
+use crate::lisp::error::{EvalError, LispError};
 
 #[derive(Debug, Copy, Clone)]
 pub enum LispNumber {
@@ -15,7 +15,7 @@ impl LispNumber {
     pub fn div(self, rhs: Self) -> Result<LispNumber, LispError> {
         use LispNumber::*;
         if rhs == Integer(0) || rhs == Float(0.) {
-            return Err(LispError::EvalError);
+            return Err(EvalError::DivByZero.into());
         } else {
             return Ok(match (self, rhs) {
                 (Integer(a), Integer(b)) => Float(a as f64 / b as f64),