diff --git a/tests/custom_syntax.rs b/tests/custom_syntax.rs
index cb82491b..0f7992f4 100644
--- a/tests/custom_syntax.rs
+++ b/tests/custom_syntax.rs
@@ -193,7 +193,7 @@ fn test_custom_syntax() -> Result<(), Box<EvalAltResult>> {
     // The first symbol must be an identifier
     assert_eq!(
         *engine
-            .register_custom_syntax(&["!"], false, |_, _| Ok(Dynamic::UNIT))
+            .register_custom_syntax(["!"], false, |_, _| Ok(Dynamic::UNIT))
             .expect_err("should error")
             .err_type(),
         ParseErrorType::BadInput(LexError::ImproperSymbol(
@@ -204,9 +204,9 @@ fn test_custom_syntax() -> Result<(), Box<EvalAltResult>> {
 
     // Check self-termination
     engine
-        .register_custom_syntax(&["test1", "$block$"], true, |_, _| Ok(Dynamic::UNIT))?
-        .register_custom_syntax(&["test2", "}"], true, |_, _| Ok(Dynamic::UNIT))?
-        .register_custom_syntax(&["test3", ";"], true, |_, _| Ok(Dynamic::UNIT))?;
+        .register_custom_syntax(["test1", "$block$"], true, |_, _| Ok(Dynamic::UNIT))?
+        .register_custom_syntax(["test2", "}"], true, |_, _| Ok(Dynamic::UNIT))?
+        .register_custom_syntax(["test3", ";"], true, |_, _| Ok(Dynamic::UNIT))?;
 
     assert_eq!(engine.eval::<INT>("test1 { x = y + z; } 42")?, 42);
     assert_eq!(engine.eval::<INT>("test2 } 42")?, 42);
@@ -214,7 +214,7 @@ fn test_custom_syntax() -> Result<(), Box<EvalAltResult>> {
 
     // Register the custom syntax: var x = ???
     engine.register_custom_syntax(
-        &["var", "$ident$", "=", "$expr$"],
+        ["var", "$ident$", "=", "$expr$"],
         true,
         |context, inputs| {
             let var_name = inputs[0].get_string_value().unwrap();
diff --git a/tests/debugging.rs b/tests/debugging.rs
index 48f8d946..a35d41fc 100644
--- a/tests/debugging.rs
+++ b/tests/debugging.rs
@@ -12,7 +12,7 @@ fn test_debugging() -> Result<(), Box<EvalAltResult>> {
     let mut engine = Engine::new();
 
     engine.register_debugger(
-        || Dynamic::UNIT,
+        |_| Dynamic::UNIT,
         |_, _, _, _, _| Ok(rhai::debugger::DebuggerCommand::Continue),
     );
 
@@ -47,7 +47,7 @@ fn test_debugger_state() -> Result<(), Box<EvalAltResult>> {
     let mut engine = Engine::new();
 
     engine.register_debugger(
-        || {
+        |_| {
             // Say, use an object map for the debugger state
             let mut state = Map::new();
             // Initialize properties