Release 1.0.21

Serde's `ContentDeserializer` and `ContentRefDeserializer`
cannot deserialize struct enum variant associated data when
that data is encoded as a sequence. This failure leads to
errors when decoding an enum nested in another untagged
enum. For example:

    #[derive(Serialize, Deserialize)]
    #[serde(untagged)]
    enum Foo {
        A(Bar),
    }

    #[derive(Serialize, Deserialize)]
    enum Bar {
        B{f1: String},
    }

    let data1 = Foo::A(Bar::B{f1: "Hello".into()});
    let bytes = rmp_serde::to_vec(&data1).unwrap();
    let data2 = rmp_serde::from_slice::<Foo>(&bytes).unwrap();

Deserializing fails with the error `Syntax("data did not
match any variant of untagged enum Foo")`, but the
underlying failure occurs when decoding the associated data
of `Bar::B`.

This pull request fixes the issue by allowing
`ContentDeserializer` and `ContentRefDeserializer` to
deserialize sequence-encoded struct enum variant data.

serde/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde"
-version = "1.0.20" # remember to update html_root_url
+version = "1.0.21" # remember to update html_root_url
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>", "David Tolnay <dtolnay@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "A generic serialization/deserialization framework"

serde/src/lib.rs

@@ -79,7 +79,7 @@
 ////////////////////////////////////////////////////////////////////////////////
 
 // Serde types in rustdoc of other crates get linked to here.
-#![doc(html_root_url = "https://docs.rs/serde/1.0.20")]
+#![doc(html_root_url = "https://docs.rs/serde/1.0.21")]
 
 // Support using Serde without the standard library!
 #![cfg_attr(not(feature = "std"), no_std)]

serde/src/private/de.rs

@@ -1246,6 +1246,9 @@ mod content {
                 Some(Content::Map(v)) => {
                     de::Deserializer::deserialize_any(MapDeserializer::new(v), visitor)
                 }
+                Some(Content::Seq(v)) => {
+                    de::Deserializer::deserialize_any(SeqDeserializer::new(v), visitor)
+                }
                 Some(other) => Err(de::Error::invalid_type(other.unexpected(), &"struct variant"),),
                 _ => Err(de::Error::invalid_type(de::Unexpected::UnitVariant, &"struct variant"),),
             }
@@ -1640,6 +1643,9 @@ mod content {
                 Some(&Content::Map(ref v)) => {
                     de::Deserializer::deserialize_any(MapRefDeserializer::new(v), visitor)
                 }
+                Some(&Content::Seq(ref v)) => {
+                    de::Deserializer::deserialize_any(SeqRefDeserializer::new(v), visitor)
+                }
                 Some(other) => Err(de::Error::invalid_type(other.unexpected(), &"struct variant"),),
                 _ => Err(de::Error::invalid_type(de::Unexpected::UnitVariant, &"struct variant"),),
             }

serde_derive/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde_derive"
-version = "1.0.20" # remember to update html_root_url
+version = "1.0.21" # remember to update html_root_url
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>", "David Tolnay <dtolnay@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "Macros 1.1 implementation of #[derive(Serialize, Deserialize)]"

serde_derive/src/lib.rs

@@ -22,7 +22,7 @@
 //!
 //! [https://serde.rs/derive.html]: https://serde.rs/derive.html
 
-#![doc(html_root_url = "https://docs.rs/serde_derive/1.0.20")]
+#![doc(html_root_url = "https://docs.rs/serde_derive/1.0.21")]
 
 #![cfg_attr(feature = "cargo-clippy", allow(too_many_arguments))]
 #![cfg_attr(feature = "cargo-clippy", allow(used_underscore_binding))]

serde_test/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde_test"
-version = "1.0.20" # remember to update html_root_url
+version = "1.0.21" # remember to update html_root_url
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>", "David Tolnay <dtolnay@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "Token De/Serializer for testing De/Serialize implementations"

serde_test/src/lib.rs

@@ -155,7 +155,7 @@
 //! # }
 //! ```
 
-#![doc(html_root_url = "https://docs.rs/serde_test/1.0.20")]
+#![doc(html_root_url = "https://docs.rs/serde_test/1.0.21")]
 
 #![cfg_attr(feature = "cargo-clippy", deny(clippy, clippy_pedantic))]
 // Whitelisted clippy lints