diff --git a/dust-lang/src/ast/expression.rs b/dust-lang/src/ast/expression.rs
index 60c65d4..1d5a62c 100644
--- a/dust-lang/src/ast/expression.rs
+++ b/dust-lang/src/ast/expression.rs
@@ -2,7 +2,6 @@ use std::{
     cmp::Ordering,
     collections::HashMap,
     fmt::{self, Display, Formatter},
-    rc::Weak,
 };
 
 use serde::{Deserialize, Serialize};
diff --git a/dust-lang/src/built_in_function.rs b/dust-lang/src/built_in_function.rs
index 22f418f..d025fc9 100644
--- a/dust-lang/src/built_in_function.rs
+++ b/dust-lang/src/built_in_function.rs
@@ -128,7 +128,10 @@ impl BuiltInFunction {
             }
             BuiltInFunction::WriteLine => {
                 if let Value::String(string) = &value_arguments[0] {
-                    stdout().write_all(string.as_bytes())?;
+                    let mut stdout = stdout();
+
+                    stdout.write_all(string.as_bytes())?;
+                    stdout.write_all(b"\n")?;
 
                     Ok(None)
                 } else {
diff --git a/dust-lang/src/core_library.rs b/dust-lang/src/core_library.rs
index 8b687db..90dc28e 100644
--- a/dust-lang/src/core_library.rs
+++ b/dust-lang/src/core_library.rs
@@ -43,6 +43,15 @@ pub fn core_library<'a>() -> &'a Context {
                     (0, 0),
                 ),
             ),
+            (
+                Identifier::new("write_line"),
+                (
+                    ContextData::VariableValue(Value::Function(Function::BuiltIn(
+                        BuiltInFunction::WriteLine,
+                    ))),
+                    (0, 0),
+                ),
+            ),
         ]))
     })
 }
diff --git a/dust-lang/src/value.rs b/dust-lang/src/value.rs
index 6818f82..2cf7626 100644
--- a/dust-lang/src/value.rs
+++ b/dust-lang/src/value.rs
@@ -792,15 +792,25 @@ impl Value {
     }
 
     pub fn and(&self, other: &Value) -> Result<Value, ValueError> {
-        match (self.as_boolean(), other.as_boolean()) {
-            (Some(left), Some(right)) => Ok(Value::Boolean(left && right)),
+        match (self, other) {
+            (Value::Boolean(left), Value::Boolean(right)) => Ok(Value::Boolean(*left && *right)),
+            (Value::Mutable(locked), value) | (value, Value::Mutable(locked)) => {
+                let locked = locked.read().unwrap();
+
+                locked.and(value)
+            }
             _ => Err(ValueError::CannotAnd(self.clone(), other.clone())),
         }
     }
 
     pub fn or(&self, other: &Value) -> Result<Value, ValueError> {
-        match (self.as_boolean(), other.as_boolean()) {
-            (Some(left), Some(right)) => Ok(Value::Boolean(left || right)),
+        match (self, other) {
+            (Value::Boolean(left), Value::Boolean(right)) => Ok(Value::Boolean(*left || *right)),
+            (Value::Mutable(locked), value) | (value, Value::Mutable(locked)) => {
+                let locked = locked.read().unwrap();
+
+                locked.or(value)
+            }
             _ => Err(ValueError::CannotOr(self.clone(), other.clone())),
         }
     }
diff --git a/dust-lang/src/vm.rs b/dust-lang/src/vm.rs
index 3492d59..f4dfee9 100644
--- a/dust-lang/src/vm.rs
+++ b/dust-lang/src/vm.rs
@@ -965,19 +965,17 @@ impl Vm {
                     .ok_or(RuntimeError::ExpectedBoolean { position })?;
 
                 if boolean {
-                    let evaluation = self.run_block(if_block.inner, collect_garbage)?;
-
-                    if let Evaluation::Break(_) = evaluation {
-                        return Ok(evaluation);
+                    self.run_block(if_block.inner, collect_garbage)
+                } else {
+                    match r#else {
+                        ElseExpression::If(if_expression) => {
+                            self.run_if(*if_expression.inner, collect_garbage)
+                        }
+                        ElseExpression::Block(block) => {
+                            self.run_block(block.inner, collect_garbage)
+                        }
                     }
                 }
-
-                match r#else {
-                    ElseExpression::If(if_expression) => {
-                        self.run_if(*if_expression.inner, collect_garbage)
-                    }
-                    ElseExpression::Block(block) => self.run_block(block.inner, collect_garbage),
-                }
             }
         }
     }
diff --git a/examples/fizzbuzz.ds b/examples/fizzbuzz.ds
index 3eda4a7..eb9bd42 100644
--- a/examples/fizzbuzz.ds
+++ b/examples/fizzbuzz.ds
@@ -1,18 +1,18 @@
-count = 1
+let mut count = 1;
 
 while count <= 15 {
-	divides_by_3 = count % 3 == 0
-	divides_by_5 = count % 5 == 0
+	let divides_by_3 = count % 3 == 0;
+	let divides_by_5 = count % 5 == 0;
 
-	output = if divides_by_3 && divides_by_5 {
-		'fizzbuzz'
+	let output = if divides_by_3 && divides_by_5 {
+		"fizzbuzz"
 	} else if divides_by_3 {
-		'fizz'
+		"fizz"
 	} else if divides_by_5 {
-		'buzz'
+		"buzz"
 	} else {
 		count.to_string()
-	}
+	};
 
 	write_line(output)