From d5f18f8e2f91e3b7ba43c79ca1466d73aa5eb7b8 Mon Sep 17 00:00:00 2001
From: Alistair <ajo41@cam.ac.uk>
Date: Tue, 7 Nov 2023 10:33:58 +0000
Subject: [PATCH] Update `[[HostDefined]]` example.

---
 boa_examples/src/bin/host_defined.rs | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/boa_examples/src/bin/host_defined.rs b/boa_examples/src/bin/host_defined.rs
index c60d4c4dcfb..9425a02f4a5 100644
--- a/boa_examples/src/bin/host_defined.rs
+++ b/boa_examples/src/bin/host_defined.rs
@@ -34,14 +34,15 @@ fn main() -> Result<(), JsError> {
 
     // Insert a default CustomHostDefinedStruct.
     realm
-        .host_defined()
+        .host_defined_mut()
         .insert_default::<CustomHostDefinedStruct>();
 
     {
         assert!(realm.host_defined().has::<CustomHostDefinedStruct>());
 
         // Get the [[HostDefined]] field from the realm and downcast it to our concrete type.
-        let Some(host_defined) = realm.host_defined().get::<CustomHostDefinedStruct>() else {
+        let host_defined = realm.host_defined();
+        let Some(host_defined) = host_defined.get::<CustomHostDefinedStruct>() else {
             return Err(JsNativeError::typ()
                 .with_message("Realm does not have HostDefined field")
                 .into());
@@ -53,15 +54,15 @@ fn main() -> Result<(), JsError> {
 
     // Insert another struct with state into [[HostDefined]] field.
     realm
-        .host_defined()
+        .host_defined_mut()
         .insert(AnotherCustomHostDefinedStruct::new(10));
 
     {
         assert!(realm.host_defined().has::<AnotherCustomHostDefinedStruct>());
 
         // Get the [[HostDefined]] field from the realm and downcast it to our concrete type.
-        let Some(host_defined) = realm.host_defined().get::<AnotherCustomHostDefinedStruct>()
-        else {
+        let host_defined = realm.host_defined();
+        let Some(host_defined) = host_defined.get::<AnotherCustomHostDefinedStruct>() else {
             return Err(JsNativeError::typ()
                 .with_message("Realm does not have HostDefined field")
                 .into());
@@ -73,7 +74,7 @@ fn main() -> Result<(), JsError> {
 
     // Remove a type from the [[HostDefined]] field.
     assert!(realm
-        .host_defined()
+        .host_defined_mut()
         .remove::<AnotherCustomHostDefinedStruct>()
         .is_some());
 
@@ -86,8 +87,8 @@ fn main() -> Result<(), JsError> {
         NativeFunction::from_fn_ptr(|_, args, context| {
             let value: usize = args.get_or_undefined(0).try_js_into(context)?;
 
-            let host_defined = context.realm().host_defined();
-            let Some(mut host_defined) = host_defined.get_mut::<CustomHostDefinedStruct>() else {
+            let mut host_defined = context.realm().host_defined_mut();
+            let Some(host_defined) = host_defined.get_mut::<CustomHostDefinedStruct>() else {
                 return Err(JsNativeError::typ()
                     .with_message("Realm does not have HostDefined field")
                     .into());
@@ -122,7 +123,8 @@ fn main() -> Result<(), JsError> {
     ",
     ))?;
 
-    let Some(host_defined) = realm.host_defined().get::<CustomHostDefinedStruct>() else {
+    let host_defined = realm.host_defined();
+    let Some(host_defined) = host_defined.get::<CustomHostDefinedStruct>() else {
         return Err(JsNativeError::typ()
             .with_message("Realm does not have HostDefined field")
             .into());