diff --git a/tests/test_func.rs b/tests/test_func.rs
index 688fbc8..6868fe4 100644
--- a/tests/test_func.rs
+++ b/tests/test_func.rs
@@ -59,7 +59,7 @@ mod func_tests {
     #[test]
     fn decl_and_call_external_func_singlet() {
         match lex("((input))".to_string()) {
-            Err(e) => panic!(e),
+            Err(e) => panic!("{}", e),
             Ok(finner) => {
                 let test_external_func: Function = Function{
                     name: String::from("echo"),
@@ -113,7 +113,7 @@ mod func_tests {
     #[test]
     fn decl_and_call_external_func_multi_body() {
         match lex("((input) (input))".to_string()) {
-            Err(e) => panic!(e),
+            Err(e) => panic!("{}", e),
             Ok(finner) => {
                 let test_external_func: Function = Function{
                     name: String::from("echo_2"),
@@ -191,7 +191,7 @@ mod func_tests {
         };
 
         match lex("((test_inner true))".to_string()) {
-            Err(e) => panic!(e),
+            Err(e) => panic!("{}", e),
             Ok(finner) => {
                 let outer_func: Function = Function{
                     name: String::from("test_outer"),