Fix #[derive_deserialize] for deserializing empty sequences named units

serde2/serde2_macros/src/lib.rs

@@ -827,6 +827,15 @@ fn deserialize_struct_empty_fields(
                     Err(::serde2::de::Error::syntax_error())
                 }
             }
+
+
+            #[inline]
+            fn visit_seq<V>(&mut self, mut visitor: V) -> Result<$type_ident, V::Error>
+                where V: de::SeqVisitor,
+            {
+                try!(visitor.end());
+                self.visit_unit()
+            }
         }
 
         $state.visit(__Visitor)

serde2/tests/test_de.rs

@@ -324,45 +324,9 @@ impl<'a, 'b> de::EnumVisitor for TokenDeserializerEnumVisitor<'a, 'b> {
 //////////////////////////////////////////////////////////////////////////
 
 #[derive(Copy, PartialEq, Debug)]
+#[derive_deserialize]
 struct NamedUnit;
 
-impl Deserialize for NamedUnit {
-    fn deserialize<D>(deserializer: &mut D) -> Result<NamedUnit, D::Error>
-        where D: Deserializer,
-    {
-        deserializer.visit(NamedUnitVisitor)
-    }
-}
-
-struct NamedUnitVisitor;
-
-impl Visitor for NamedUnitVisitor {
-    type Value = NamedUnit;
-
-    fn visit_unit<E>(&mut self) -> Result<NamedUnit, E>
-        where E: de::Error,
-    {
-        Ok(NamedUnit)
-    }
-
-    fn visit_named_unit<E>(&mut self, name: &str) -> Result<NamedUnit, E>
-        where E: de::Error,
-    {
-        if name == "NamedUnit" {
-            Ok(NamedUnit)
-        } else {
-            Err(de::Error::syntax_error())
-        }
-    }
-
-    fn visit_seq<V>(&mut self, mut visitor: V) -> Result<NamedUnit, V::Error>
-        where V: de::SeqVisitor,
-    {
-        try!(visitor.end());
-        Ok(NamedUnit)
-    }
-}
-
 //////////////////////////////////////////////////////////////////////////
 
 #[derive(PartialEq, Debug)]