xso-proc: provide FromXml::xml_name_matcher on derived impls

That way, derived implementations can also make use of the performance
benefits.

parsers/src/util/macro_tests.rs

@@ -94,6 +94,14 @@ fn empty_roundtrip() {
     roundtrip_full::<Empty>("<foo xmlns='urn:example:ns1'/>");
 }
 
+#[test]
+fn empty_xml_name_matcher_is_specific() {
+    assert_eq!(
+        Empty::xml_name_matcher(),
+        xso::fromxml::XmlNameMatcher::Specific(NS1, "foo")
+    );
+}
+
 #[test]
 fn empty_name_mismatch() {
     #[allow(unused_imports)]
@@ -717,6 +725,14 @@ enum NameSwitchedEnum {
     },
 }
 
+#[test]
+fn name_switched_enum_matcher_is_in_namespace() {
+    assert_eq!(
+        NameSwitchedEnum::xml_name_matcher(),
+        xso::fromxml::XmlNameMatcher::InNamespace(NS1)
+    );
+}
+
 #[test]
 fn name_switched_enum_positive_variant_1() {
     #[allow(unused_imports)]
@@ -1844,6 +1860,14 @@ enum DynamicEnum {
     },
 }
 
+#[test]
+fn dynamic_enum_matcher_is_any() {
+    assert_eq!(
+        DynamicEnum::xml_name_matcher(),
+        xso::fromxml::XmlNameMatcher::Any
+    );
+}
+
 #[test]
 fn dynamic_enum_roundtrip_a() {
     #[allow(unused_imports)]
@@ -1903,6 +1927,27 @@ fn fallible_parse_positive_err() {
     }
 }
 
+#[derive(FromXml, AsXml, PartialEq, Debug, Clone)]
+#[xml()]
+enum DynamicEnumWithSharedNamespace {
+    #[xml(transparent)]
+    A(RequiredAttribute),
+
+    #[xml(namespace = NS1, name = "b")]
+    B {
+        #[xml(text)]
+        contents: String,
+    },
+}
+
+#[test]
+fn dynamic_enum_with_shared_namespace_matcher_is_in_namespace() {
+    assert_eq!(
+        DynamicEnumWithSharedNamespace::xml_name_matcher(),
+        xso::fromxml::XmlNameMatcher::InNamespace(NS1)
+    );
+}
+
 #[derive(FromXml, AsXml, PartialEq, Debug, Clone)]
 #[xml(namespace = NS1, name = "parent")]
 struct ExtractTupleToCollection {