Fix bug in catch error variable.

CHANGELOG.md

@@ -1,7 +1,7 @@
 Rhai Release Notes
 ==================
 
-Version 1.0.3
+Version 1.0.4
 =============
 
 Bug fixes

src/parse.rs

@@ -2902,7 +2902,7 @@ fn parse_try_catch(
     }
 
     // try { body } catch (
-    let var_def = if match_token(input, Token::LeftParen).0 {
+    let err_var = if match_token(input, Token::LeftParen).0 {
         let (name, pos) = parse_var_name(input)?;
         let (matched, err_pos) = match_token(input, Token::RightParen);
 
@@ -2924,8 +2924,16 @@ fn parse_try_catch(
     // try { body } catch ( var ) { catch_block }
     let catch_body = parse_block(input, state, lib, settings.level_up())?;
 
+    if err_var.is_some() {
+        // Remove the error variable from the stack
+        state
+            .stack
+            .pop()
+            .expect("stack contains at least one entry");
+    }
+
     Ok(Stmt::TryCatch(
-        (body.into(), var_def, catch_body.into()).into(),
+        (body.into(), err_var, catch_body.into()).into(),
         settings.pos,
     ))
 }

tests/throw.rs

@@ -51,6 +51,18 @@ fn test_try_catch() -> Result<(), Box<EvalAltResult>> {
         42
     );
 
+    assert_eq!(
+        engine.eval::<INT>(
+            "
+                let err = 123;
+                let x = 0;
+                try { throw 42; } catch(err) { print(err); }
+                err
+            "
+        )?,
+        123
+    );
+
     assert_eq!(
         engine.eval::<INT>(
             "