Improve read functionality.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/lib/tokenize.rs b/src/lib/tokenize.rs
index 0a50036..483536f 100644
--- a/src/lib/tokenize.rs
+++ b/src/lib/tokenize.rs
@@ -1,4 +1,5 @@
 use super::types::Type;
+use super::types::FloatType;
 use super::types::Number;
 use super::types::Op;
 use super::sexpr::SExpr;
@@ -242,7 +243,7 @@ pub fn is_int(word: &str) -> MaybeToken {
 }
 
 pub fn is_float(word: &str) -> MaybeToken {
-    match word.parse::<f32>() {
+    match word.parse::<FloatType>() {
         Ok(x) => (Some(Ok(Token::Value(Type::Number(Number::Float(x))))), word.len()),
         _ => (None, 0)
     }
@@ -268,7 +269,7 @@ pub fn descend(tokenstream: &mut TokenStream) -> Result<SExpr, String> {
         let token = match tokenstream.next() {
             Some(Ok(x)) => x,
             Some(Err(f)) => return Err(f),
-            None => panic!("Empty string".to_string())
+            None => return Err("Unexpected end of expression".to_string())
         };
 
         match token {