diff --git a/README.md b/README.md
index c78534a0..a379b829 100644
--- a/README.md
+++ b/README.md
@@ -146,7 +146,7 @@ let ast = Engine::compile("fn hello(x, y) { x.len() + y }")?;
 
 // Evaluate the function in the AST, passing arguments into the script as a tuple
 // (beware, arguments must be of the correct types because Rhai does not have built-in type conversions)
-let result: i64 = engine.call_fn("hello", ast, (&mut String::from("abc"), &mut 123_i64))?;
+let result: i64 = engine.call_fn("hello", &ast, (&mut String::from("abc"), &mut 123_i64))?;
 ```
 
 # Values and types
diff --git a/src/api.rs b/src/api.rs
index b27378f2..d38dad9a 100644
--- a/src/api.rs
+++ b/src/api.rs
@@ -9,7 +9,7 @@ use crate::scope::Scope;
 use std::any::TypeId;
 use std::sync::Arc;
 
-impl<'a> Engine<'a> {
+impl<'e> Engine<'e> {
     pub(crate) fn register_fn_raw(
         &mut self,
         fn_name: &str,
@@ -169,7 +169,7 @@ impl<'a> Engine<'a> {
 
         let result = statements
             .iter()
-            .try_fold(().into_dynamic(), |_, o| self.eval_stmt(scope, o));
+            .try_fold(().into_dynamic(), |_, stmt| self.eval_stmt(scope, stmt));
 
         self.script_functions.clear(); // Clean up engine
 
@@ -261,7 +261,7 @@ impl<'a> Engine<'a> {
     ///
     /// let ast = Engine::compile("fn add(x, y) { x.len() + y }")?;
     ///
-    /// let result: i64 = engine.call_fn("add", ast, (&mut String::from("abc"), &mut 123_i64))?;
+    /// let result: i64 = engine.call_fn("add", &ast, (&mut String::from("abc"), &mut 123_i64))?;
     ///
     /// assert_eq!(result, 126);
     /// # Ok(())
@@ -270,7 +270,7 @@ impl<'a> Engine<'a> {
     pub fn call_fn<'f, A: FuncArgs<'f>, T: Any + Clone>(
         &mut self,
         name: &str,
-        ast: AST,
+        ast: &AST,
         args: A,
     ) -> Result<T, EvalAltResult> {
         let pos = Default::default();
@@ -317,7 +317,7 @@ impl<'a> Engine<'a> {
     /// }
     /// assert_eq!(result, "42");
     /// ```
-    pub fn on_print(&mut self, callback: impl FnMut(&str) + 'a) {
+    pub fn on_print(&mut self, callback: impl FnMut(&str) + 'e) {
         self.on_print = Box::new(callback);
     }
 
@@ -337,7 +337,7 @@ impl<'a> Engine<'a> {
     /// }
     /// assert_eq!(result, "\"hello\"");
     /// ```
-    pub fn on_debug(&mut self, callback: impl FnMut(&str) + 'a) {
+    pub fn on_debug(&mut self, callback: impl FnMut(&str) + 'e) {
         self.on_debug = Box::new(callback);
     }
 }
diff --git a/tests/engine.rs b/tests/engine.rs
index 082daaa4..8db972c4 100644
--- a/tests/engine.rs
+++ b/tests/engine.rs
@@ -6,7 +6,7 @@ fn test_engine_call_fn() -> Result<(), EvalAltResult> {
 
     let ast = Engine::compile("fn hello(x, y) { x.len() + y }")?;
 
-    let result: i64 = engine.call_fn("hello", ast, (&mut String::from("abc"), &mut 123_i64))?;
+    let result: i64 = engine.call_fn("hello", &ast, (&mut String::from("abc"), &mut 123_i64))?;
 
     assert_eq!(result, 126);