When compiling with a very recent gcc, we get the compilation error: 

```
/home/jyavenard/Work/webkit/OpenSource/Source/WebCore/dom/TreeScopeOrderedMap.cpp: In instantiation of ‘WTF::RefPtr<WebCore::Element> WebCore::TreeScopeOrderedMap::get(const WTF::AtomString&, const WebCore::TreeScope&, const KeyMatchingFunction&) const [with KeyMatchingFunction = WebCore::TreeScopeOrderedMap::getElementById(const WTF::AtomString&, const WebCore::TreeScope&) const::<lambda(const WTF::AtomString&, const WebCore::Element&)>]’:
/home/jyavenard/Work/webkit/OpenSource/Source/WebCore/dom/TreeScopeOrderedMap.cpp:180:15:   required from here
/home/jyavenard/Work/webkit/OpenSource/Source/WebCore/dom/TreeScopeOrderedMap.cpp:121:5: error: possibly dangling reference to a temporary [-Werror=dangling-reference]
  121 |     for (Ref element : descendantsOfType<Element>(scope.protectedRootNode().get())) {
      |     ^~~
/home/jyavenard/Work/webkit/OpenSource/Source/WebCore/dom/TreeScopeOrderedMap.cpp:121:50: note: the temporary was destroyed at the end of the full expression ‘WebCore::descendantsOfType<Element>((* & WebCore::TreeScope::protectedRootNode() const().WTF::Ref<WebCore::ContainerNode>::get()))’
  121 |     for (Ref element : descendantsOfType<Element>(scope.protectedRootNode().get())) {
      |                        ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/jyavenard/Work/webkit/OpenSource/Source/WebCore/dom/TreeScopeOrderedMap.cpp: In instantiation of ‘WTF::RefPtr<WebCore::Element> WebCore::TreeScopeOrderedMap::get(const WTF::AtomString&, const WebCore::TreeScope&, const KeyMatchingFunction&) const [with KeyMatchingFunction = WebCore::TreeScopeOrderedMap::getElementByName(const WTF::AtomString&, const WebCore::TreeScope&) const::<lambda(const WTF::AtomString&, const WebCore::Element&)>]’:
/home/jyavenard/Work/webkit/OpenSource/Source/WebCore/dom/TreeScopeOrderedMap.cpp:187:15:   required from here
/home/jyavenard/Work/webkit/OpenSource/Source/WebCore/dom/TreeScopeOrderedMap.cpp:121:5: error: possibly dangling reference to a temporary [-Werror=dangling-reference]
  121 |     for (Ref element : descendantsOfType<Element>(scope.protectedRootNode().get())) {
      |     ^~~
/home/jyavenard/Work/webkit/OpenSource/Source/WebCore/dom/TreeScopeOrderedMap.cpp:121:50: note: the temporary was destroyed at the end of the full expression ‘WebCore::descendantsOfType<Element>((* & WebCore::TreeScope::protectedRootNode() const().WTF::Ref<WebCore::ContainerNode>::get()))’
  121 |     for (Ref element : descendantsOfType<Element>(scope.protectedRootNode().get())) {
      |                        ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/jyavenard/Work/webkit/OpenSource/Source/WebCore/dom/TreeScopeOrderedMap.cpp: In instantiation of ‘WTF::RefPtr<WebCore::Element> WebCore::TreeScopeOrderedMap::get(const WTF::AtomString&, const WebCore::TreeScope&, const KeyMatchingFunction&) const [with KeyMatchingFunction = WebCore::TreeScopeOrderedMap::getElementByMapName(const WTF::AtomString&, const WebCore::TreeScope&) const::<lambda(const WTF::AtomString&, const WebCore::Element&)>]’:
/home/jyavenard/Work/webkit/OpenSource/Source/WebCore/dom/TreeScopeOrderedMap.cpp:194:40:   required from here
/home/jyavenard/Work/webkit/OpenSource/Source/WebCore/dom/TreeScopeOrderedMap.cpp:121:5: error: possibly dangling reference to a temporary [-Werror=dangling-reference]
  121 |     for (Ref element : descendantsOfType<Element>(scope.protectedRootNode().get())) {
      |     ^~~
/home/jyavenard/Work/webkit/OpenSource/Source/WebCore/dom/TreeScopeOrderedMap.cpp:121:50: note: the temporary was destroyed at the end of the full expression ‘WebCore::descendantsOfType<Element>((* & WebCore::TreeScope::protectedRootNode() const().WTF::Ref<WebCore::ContainerNode>::get()))’
  121 |     for (Ref element : descendantsOfType<Element>(scope.protectedRootNode().get())) {
      |                        ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```