Complete coverage of ContentRefDeserializer::deserialize_newtype_struct

2026-04-29 14:07:55 +00:00 · 2024-08-17 11:31:50 +05:00
parent 2dddc7796d
commit 171c6da57a
2 changed files with 15 additions and 1 deletions
@@ -1938,10 +1938,17 @@ mod content {
        where
            V: Visitor<'de>,
        {
+            // Covered by tests/test_enum_untagged.rs
+            //      newtype_struct
            match *self.content {
                Content::Newtype(ref v) => {
                    visitor.visit_newtype_struct(ContentRefDeserializer::new(v))
                }
+                // This case is necessary for formats which does not store marker of a newtype,
+                // for example, JSON. When `deserialize_any` is requested from such formats, they will
+                // report value without using `Visitor::visit_newtype_struct`, because they do not
+                // known in which contexts this value will be used.
+                // RON is example of format which preserve markers.
                _ => visitor.visit_newtype_struct(self),
            }
        }