diff --git a/src/api/custom_syntax.rs b/src/api/custom_syntax.rs
index 978ba920..b7c1f48b 100644
--- a/src/api/custom_syntax.rs
+++ b/src/api/custom_syntax.rs
@@ -331,7 +331,7 @@ impl Engine {
     ///
     /// The implementation function has the following signature:
     ///
-    /// > `Fn(symbols: &[ImmutableString], look_ahead: &str) -> Result<Option<ImmutableString>, ParseError>`
+    /// `Fn(symbols: &[ImmutableString], look_ahead: &str) -> Result<Option<ImmutableString>, ParseError>`
     ///
     /// where:
     /// * `symbols`: a slice of symbols that have been parsed so far, possibly containing `$expr$` and/or `$block$`;
diff --git a/src/api/events.rs b/src/api/events.rs
index 7ac2e2c5..ec7b5022 100644
--- a/src/api/events.rs
+++ b/src/api/events.rs
@@ -27,7 +27,7 @@ impl Engine {
     ///
     /// # Callback Function Signature
     ///
-    /// > `Fn(name: &str, index: usize, context: EvalContext) -> Result<Option<Dynamic>, Box<EvalAltResult>>`
+    /// `Fn(name: &str, index: usize, context: EvalContext) -> Result<Option<Dynamic>, Box<EvalAltResult>>`
     ///
     /// where:
     /// * `name`: name of the variable.
@@ -87,7 +87,7 @@ impl Engine {
     ///
     /// # Callback Function Signature
     ///
-    /// > `Fn(is_runtime: bool, info: VarInfo, context: EvalContext) -> Result<bool, Box<EvalAltResult>>`
+    /// `Fn(is_runtime: bool, info: VarInfo, context: EvalContext) -> Result<bool, Box<EvalAltResult>>`
     ///
     /// where:
     /// * `is_runtime`: `true` if the variable definition event happens during runtime, `false` if during compilation.
@@ -148,7 +148,7 @@ impl Engine {
     ///
     /// # Callback Function Signature
     ///
-    /// > `Fn(token: Token, pos: Position, state: &TokenizeState) -> Token`
+    /// `Fn(token: Token, pos: Position, state: &TokenizeState) -> Token`
     ///
     /// where:
     /// * [`token`][crate::tokenizer::Token]: current token parsed
@@ -210,9 +210,7 @@ impl Engine {
     ///
     /// # Callback Function Signature
     ///
-    /// The callback function signature takes the following form:
-    ///
-    /// > `Fn(counter: u64) -> Option<Dynamic>`
+    /// `Fn(counter: u64) -> Option<Dynamic>`
     ///
     /// ## Return value
     ///
@@ -295,7 +293,7 @@ impl Engine {
     ///
     /// The callback function signature passed takes the following form:
     ///
-    /// > `Fn(text: &str, source: Option<&str>, pos: Position)`
+    /// `Fn(text: &str, source: Option<&str>, pos: Position)`
     ///
     /// where:
     /// * `text`: the text to display
diff --git a/tests/var_scope.rs b/tests/var_scope.rs
index 4e50c3dd..014ec42b 100644
--- a/tests/var_scope.rs
+++ b/tests/var_scope.rs
@@ -202,15 +202,9 @@ fn test_var_def_filter() -> Result<(), Box<EvalAltResult>> {
     let ast = engine.compile("let x = 42;")?;
     engine.run_ast(&ast)?;
 
-    engine.on_def_var(|_, info, mut ctx| {
-        if ctx.tag().is::<()>() {
-            *ctx.tag_mut() = rhai::Dynamic::ONE;
-        }
-        println!("Tag = {}", ctx.tag());
-        match (info.name, info.nesting_level) {
-            ("x", 0 | 1) => Ok(false),
-            _ => Ok(true),
-        }
+    engine.on_def_var(|_, info, _| match (info.name, info.nesting_level) {
+        ("x", 0 | 1) => Ok(false),
+        _ => Ok(true),
     });
 
     assert_eq!(