Bump clippy dependency to compile on 1.8.

Closes #51, #175, and #187

README.md

@@ -579,6 +579,69 @@ impl serde::de::Visitor for PointVisitor {
 }
 ```
 
+Design Considerations and tradeoffs for Serializers and Deserializers
+=====================================================================
+
+Serde serialization and deserialization implementations are written in such a
+way that they err on being able to represent more values, and also provide
+better error messages when they are passed an incorrect type to deserialize
+from. For example, by default, it is a syntax error to deserialize a `String`
+into an `Option<String>`. This is implemented such that it is possible to
+distinguish between the values `None` and `Some(())`, if the serialization
+format supports option types.
+
+However, many formats do not have option types, and represents optional values
+as either a `null`, or some other value. Serde `Serializer`s and
+`Deserializer`s can opt-in support for this. For serialization, this is pretty
+easy. Simply implement these methods:
+
+```rust
+...
+
+    fn visit_none(&mut self) -> Result<(), Self::Error> {
+        self.visit_unit()
+    }
+
+    fn visit_some<T>(&mut self, value: T) -> Result<(), Self::Error> {
+        value.serialize(self)
+    }
+...
+```
+
+For deserialization, this can be implemented by way of the
+`Deserializer::visit_option` hook, which presumes that there is some ability to peek at what is the
+next value in the serialized token stream. This following example is from
+[serde_tests::TokenDeserializer](https://github.com/serde-rs/serde/blob/master/serde_tests/tests/token.rs#L435-L454),
+where it checks to see if the next value is an `Option`, a `()`, or some other
+value:
+
+```rust
+...
+
+    fn visit_option<V>(&mut self, mut visitor: V) -> Result<V::Value, Error>
+        where V: de::Visitor,
+    {
+        match self.tokens.peek() {
+            Some(&Token::Option(false)) => {
+                self.tokens.next();
+                visitor.visit_none()
+            }
+            Some(&Token::Option(true)) => {
+                self.tokens.next();
+                visitor.visit_some(self)
+            }
+            Some(&Token::Unit) => {
+                self.tokens.next();
+                visitor.visit_none()
+            }
+            Some(_) => visitor.visit_some(self),
+            None => Err(Error::EndOfStreamError),
+        }
+    }
+
+...
+```
+
 Annotations
 ===========
 

serde/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde"
-version = "0.6.7"
+version = "0.6.11"
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "A generic serialization/deserialization framework"
@@ -9,12 +9,13 @@ documentation = "https://serde-rs.github.io/serde/serde/serde/index.html"
 readme = "../README.md"
 keywords = ["serde", "serialization"]
 
-[dependencies]
-num = "^0.1.27"
-
 [features]
-nightly = []
-num-impls = ["num-bigint", "num-complex", "num-rational"]
+nightly = ["clippy"]
 num-bigint = ["num/bigint"]
 num-complex = ["num/complex"]
+num-impls = ["num-bigint", "num-complex", "num-rational"]
 num-rational = ["num/rational"]
+
+[dependencies]
+clippy = { version = "^0.0.37", optional = true }
+num = { version = "^0.1.27", default-features = false }

serde/src/de/impls.rs

@@ -154,7 +154,9 @@ impl<
     fn visit_str<E>(&mut self, v: &str) -> Result<T, E>
         where E: Error,
     {
-        str::FromStr::from_str(v.trim()).or(Err(Error::type_mismatch(Type::Str)))
+        str::FromStr::from_str(v.trim()).or_else(|_| {
+            Err(Error::type_mismatch(Type::Str))
+        })
     }
 }
 
@@ -234,7 +236,7 @@ impl Visitor for StringVisitor {
     fn visit_str<E>(&mut self, v: &str) -> Result<String, E>
         where E: Error,
     {
-        Ok(v.to_string())
+        Ok(v.to_owned())
     }
 
     fn visit_string<E>(&mut self, v: String) -> Result<String, E>
@@ -247,12 +249,12 @@ impl Visitor for StringVisitor {
         where E: Error,
     {
         match str::from_utf8(v) {
-            Ok(s) => Ok(s.to_string()),
+            Ok(s) => Ok(s.to_owned()),
             Err(_) => Err(Error::type_mismatch(Type::String)),
         }
     }
 
-    fn visit_byte_buf<'a, E>(&mut self, v: Vec<u8>) -> Result<String, E>
+    fn visit_byte_buf<E>(&mut self, v: Vec<u8>) -> Result<String, E>
         where E: Error,
     {
         match String::from_utf8(v) {
@@ -281,6 +283,13 @@ impl<
 > Visitor for OptionVisitor<T> {
     type Value = Option<T>;
 
+    #[inline]
+    fn visit_unit<E>(&mut self) -> Result<Option<T>, E>
+        where E: Error,
+    {
+        Ok(None)
+    }
+
     #[inline]
     fn visit_none<E>(&mut self) -> Result<Option<T>, E>
         where E: Error,

serde/src/lib.rs

@@ -10,7 +10,10 @@
 //! [github repository](https://github.com/serde-rs/serde)
 
 #![doc(html_root_url="https://serde-rs.github.io/serde/serde")]
-#![cfg_attr(feature = "nightly", feature(collections, enumset, nonzero, step_trait, zero_one))]
+#![cfg_attr(feature = "nightly", feature(collections, enumset, nonzero, plugin, step_trait,
+                                         zero_one))]
+#![cfg_attr(feature = "nightly", plugin(clippy))]
+#![cfg_attr(feature = "nightly", allow(linkedlist))]
 
 #![deny(missing_docs)]
 

serde/src/ser/impls.rs

@@ -566,8 +566,8 @@ impl<K, V, I> MapVisitor for MapIteratorVisitor<I>
     {
         match self.iter.next() {
             Some((key, value)) => {
-                let value = try!(serializer.visit_map_elt(key, value));
-                Ok(Some(value))
+                try!(serializer.visit_map_elt(key, value));
+                Ok(Some(()))
             }
             None => Ok(None)
         }

serde/src/ser/mod.rs

@@ -322,6 +322,7 @@ pub trait Serializer {
 }
 
 /// A trait that is used by a `Serialize` to iterate through a sequence.
+#[cfg_attr(feature = "nightly", allow(len_without_is_empty))]
 pub trait SeqVisitor {
     /// Serializes a sequence item in the serializer.
     ///
@@ -338,6 +339,7 @@ pub trait SeqVisitor {
 }
 
 /// A trait that is used by a `Serialize` to iterate through a map.
+#[cfg_attr(feature = "nightly", allow(len_without_is_empty))]
 pub trait MapVisitor {
     /// Serializes a map item in the serializer.
     ///

serde_codegen/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde_codegen"
-version = "0.6.8"
+version = "0.6.11"
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "Macros to auto-generate implementations for the serde framework"
@@ -11,16 +11,17 @@ keywords = ["serde", "serialization"]
 
 [features]
 default = ["with-syntex"]
-nightly = ["quasi_macros"]
+nightly = ["clippy", "quasi_macros"]
 with-syntex = ["quasi/with-syntex", "quasi_codegen", "quasi_codegen/with-syntex", "syntex", "syntex_syntax"]
 
 [build-dependencies]
-quasi_codegen = { verision = "^0.3.12", optional = true }
-syntex = { version = "^0.25.0", optional = true }
+quasi_codegen = { version = "^0.4.0", optional = true }
+syntex = { version = "^0.26.0", optional = true }
 
 [dependencies]
-aster = { version = "^0.9.3", default-features = false }
-quasi = { verision = "^0.3.12", default-features = false }
-quasi_macros = { version = "^0.3.12", optional = true }
-syntex = { version = "^0.25.0", optional = true }
-syntex_syntax = { version = "^0.25.0", optional = true }
+aster = { version = "^0.10.0", default-features = false }
+clippy = { version = "^0.0.37", optional = true }
+quasi = { version = "^0.4.0", default-features = false }
+quasi_macros = { version = "^0.4.0", optional = true }
+syntex = { version = "^0.26.0", optional = true }
+syntex_syntax = { version = "^0.26.0", optional = true }

serde_codegen/src/attr.rs

@@ -4,6 +4,7 @@ use std::collections::HashSet;
 use syntax::ast;
 use syntax::attr;
 use syntax::ext::base::ExtCtxt;
+use syntax::print::pprust::meta_item_to_string;
 use syntax::ptr::P;
 
 use aster;
@@ -32,7 +33,7 @@ impl FieldAttrs {
     /// Return a set of formats that the field has attributes for.
     pub fn formats(&self) -> HashSet<P<ast::Expr>> {
         match self.names {
-            FieldNames::Format{ref formats, default: _} => {
+            FieldNames::Format { ref formats, .. } => {
                 let mut set = HashSet::new();
                 for (fmt, _) in formats.iter() {
                     set.insert(fmt.clone());
@@ -70,7 +71,7 @@ impl FieldAttrs {
     pub fn default_key_expr(&self) -> &P<ast::Expr> {
         match self.names {
             FieldNames::Global(ref expr) => expr,
-            FieldNames::Format{formats: _, ref default} => default,
+            FieldNames::Format { ref default, .. } => default,
         }
     }
 
@@ -104,6 +105,7 @@ impl FieldAttrs {
 }
 
 pub struct FieldAttrsBuilder<'a> {
+    cx: &'a ExtCtxt<'a>,
     builder: &'a aster::AstBuilder,
     skip_serializing_field: bool,
     skip_serializing_field_if_empty: bool,
@@ -114,8 +116,10 @@ pub struct FieldAttrsBuilder<'a> {
 }
 
 impl<'a> FieldAttrsBuilder<'a> {
-    pub fn new(builder: &'a aster::AstBuilder) -> FieldAttrsBuilder<'a> {
+    pub fn new(cx: &'a ExtCtxt<'a>,
+               builder: &'a aster::AstBuilder) -> FieldAttrsBuilder<'a> {
         FieldAttrsBuilder {
+            cx: cx,
             builder: builder,
             skip_serializing_field: false,
             skip_serializing_field_if_empty: false,
@@ -126,7 +130,7 @@ impl<'a> FieldAttrsBuilder<'a> {
         }
     }
 
-    pub fn field(mut self, field: &ast::StructField) -> FieldAttrsBuilder<'a> {
+    pub fn field(mut self, field: &ast::StructField) -> Result<FieldAttrsBuilder<'a>, ()> {
         match field.node.kind {
             ast::NamedField(name, _) => {
                 self.name = Some(self.builder.expr().str(name));
@@ -137,28 +141,36 @@ impl<'a> FieldAttrsBuilder<'a> {
         self.attrs(&field.node.attrs)
     }
 
-    pub fn attrs(self, attrs: &[ast::Attribute]) -> FieldAttrsBuilder<'a> {
-        attrs.iter().fold(self, FieldAttrsBuilder::attr)
+    pub fn attrs(mut self, attrs: &[ast::Attribute]) -> Result<FieldAttrsBuilder<'a>, ()> {
+        for attr in attrs {
+            self = try!(self.attr(attr));
+        }
+
+        Ok(self)
     }
 
-    pub fn attr(self, attr: &ast::Attribute) -> FieldAttrsBuilder<'a> {
+    pub fn attr(mut self, attr: &ast::Attribute) -> Result<FieldAttrsBuilder<'a>, ()> {
         match attr.node.value.node {
             ast::MetaList(ref name, ref items) if name == &"serde" => {
                 attr::mark_used(&attr);
-                items.iter().fold(self, FieldAttrsBuilder::meta_item)
+                for item in items {
+                    self = try!(self.meta_item(item));
+                }
+
+                Ok(self)
             }
             _ => {
-                self
+                Ok(self)
             }
         }
     }
 
-    pub fn meta_item(mut self, meta_item: &P<ast::MetaItem>) -> FieldAttrsBuilder<'a> {
+    pub fn meta_item(mut self, meta_item: &P<ast::MetaItem>) -> Result<FieldAttrsBuilder<'a>, ()> {
         match meta_item.node {
             ast::MetaNameValue(ref name, ref lit) if name == &"rename" => {
                 let expr = self.builder.expr().build_lit(P(lit.clone()));
 
-                self.name(expr)
+                Ok(self.name(expr))
             }
             ast::MetaList(ref name, ref items) if name == &"rename" => {
                 for item in items {
@@ -172,23 +184,27 @@ impl<'a> FieldAttrsBuilder<'a> {
                         _ => { }
                     }
                 }
-                self
+
+                Ok(self)
             }
             ast::MetaWord(ref name) if name == &"default" => {
-                self.default()
+                Ok(self.default())
             }
             ast::MetaWord(ref name) if name == &"skip_serializing" => {
-                self.skip_serializing_field()
+                Ok(self.skip_serializing_field())
             }
             ast::MetaWord(ref name) if name == &"skip_serializing_if_empty" => {
-                self.skip_serializing_field_if_empty()
+                Ok(self.skip_serializing_field_if_empty())
             }
             ast::MetaWord(ref name) if name == &"skip_serializing_if_none" => {
-                self.skip_serializing_field_if_none()
+                Ok(self.skip_serializing_field_if_none())
             }
             _ => {
-                // Ignore unknown meta variables for now.
-                self
+                self.cx.span_err(
+                    meta_item.span,
+                    &format!("unknown serde field attribute `{}`",
+                             meta_item_to_string(meta_item)));
+                Err(())
             }
         }
     }
@@ -243,3 +259,59 @@ impl<'a> FieldAttrsBuilder<'a> {
         }
     }
 }
+
+/// Represents container (e.g. struct) attribute information
+#[derive(Debug)]
+pub struct ContainerAttrs;
+
+pub struct ContainerAttrsBuilder<'a> {
+    cx: &'a ExtCtxt<'a>,
+}
+
+impl<'a> ContainerAttrsBuilder<'a> {
+    pub fn new(cx: &'a ExtCtxt) -> Self {
+        ContainerAttrsBuilder {
+            cx: cx,
+        }
+    }
+
+    pub fn attrs(mut self, attrs: &[ast::Attribute]) -> Result<Self, ()> {
+        for attr in attrs {
+            self = try!(self.attr(attr));
+        }
+
+        Ok(self)
+    }
+
+    pub fn attr(mut self, attr: &ast::Attribute) -> Result<Self, ()> {
+        match attr.node.value.node {
+            ast::MetaList(ref name, ref items) if name == &"serde" => {
+                attr::mark_used(&attr);
+                for item in items {
+                    self = try!(self.meta_item(item));
+                }
+
+                Ok(self)
+            }
+            _ => {
+                Ok(self)
+            }
+        }
+    }
+
+    pub fn meta_item(self, meta_item: &P<ast::MetaItem>) -> Result<Self, ()> {
+        match meta_item.node {
+            _ => {
+                self.cx.span_err(
+                    meta_item.span,
+                    &format!("unknown serde container attribute `{}`",
+                             meta_item_to_string(meta_item)));
+                Err(())
+            }
+        }
+    }
+
+    pub fn build(self) -> ContainerAttrs {
+        ContainerAttrs
+    }
+}

serde_codegen/src/de.rs

@@ -29,7 +29,7 @@ pub fn expand_derive_deserialize(
         _ => {
             cx.span_err(
                 meta_item.span,
-                "`derive` may only be applied to structs and enums");
+                "`#[derive(Deserialize)]` may only be applied to structs and enums");
             return;
         }
     };
@@ -39,7 +39,12 @@ pub fn expand_derive_deserialize(
     let generics = match item.node {
         ast::ItemStruct(_, ref generics) => generics,
         ast::ItemEnum(_, ref generics) => generics,
-        _ => cx.bug("expected ItemStruct or ItemEnum in #[derive(Deserialize)]")
+        _ => {
+            cx.span_err(
+                meta_item.span,
+                "`#[derive(Deserialize)]` may only be applied to structs and enums");
+            return;
+        }
     };
 
     let impl_generics = builder.from_generics(generics.clone())
@@ -52,13 +57,13 @@ pub fn expand_derive_deserialize(
         .segment(item.ident).with_generics(impl_generics.clone()).build()
         .build();
 
-    let body = deserialize_body(
-        cx,
-        &builder,
-        &item,
-        &impl_generics,
-        ty.clone(),
-    );
+    let body = match deserialize_body(cx, &builder, &item, &impl_generics, ty.clone()) {
+        Ok(body) => body,
+        Err(()) => {
+            // An error occured, but it should have been reported already.
+            return;
+        }
+    };
 
     let where_clause = &impl_generics.where_clause;
 
@@ -81,7 +86,11 @@ fn deserialize_body(
     item: &Item,
     impl_generics: &ast::Generics,
     ty: P<ast::Ty>,
-) -> P<ast::Expr> {
+) -> Result<P<ast::Expr>, ()> {
+    // Note: While we don't have any container attributes, we still want to try to
+    // parse them so we can report a proper error if we get passed an unknown attribute.
+    let _ = try!(field::container_attrs(cx, item));
+
     match item.node {
         ast::ItemStruct(ref variant_data, _) => {
             deserialize_item_struct(
@@ -90,6 +99,7 @@ fn deserialize_body(
                 item,
                 impl_generics,
                 ty,
+                item.span,
                 variant_data,
             )
         }
@@ -103,7 +113,10 @@ fn deserialize_body(
                 enum_def,
             )
         }
-        _ => cx.bug("expected ItemStruct or ItemEnum in #[derive(Deserialize)]")
+        _ => {
+            cx.span_bug(item.span,
+                        "expected ItemStruct or ItemEnum in #[derive(Deserialize)]")
+        }
     }
 }
 
@@ -113,8 +126,9 @@ fn deserialize_item_struct(
     item: &Item,
     impl_generics: &ast::Generics,
     ty: P<ast::Ty>,
+    span: Span,
     variant_data: &ast::VariantData,
-) -> P<ast::Expr> {
+) -> Result<P<ast::Expr>, ()> {
     match *variant_data {
         ast::VariantData::Unit(_) => {
             deserialize_unit_struct(
@@ -134,7 +148,7 @@ fn deserialize_item_struct(
         }
         ast::VariantData::Tuple(ref fields, _) => {
             if fields.iter().any(|field| !field.node.kind.is_unnamed()) {
-                cx.bug("tuple struct has named fields")
+                cx.span_bug(span, "tuple struct has named fields")
             }
 
             deserialize_tuple_struct(
@@ -148,7 +162,7 @@ fn deserialize_item_struct(
         }
         ast::VariantData::Struct(ref fields, _) => {
             if fields.iter().any(|field| field.node.kind.is_unnamed()) {
-                cx.bug("struct has unnamed fields")
+                cx.span_bug(span, "struct has unnamed fields")
             }
 
             deserialize_struct(
@@ -170,14 +184,14 @@ fn deserialize_visitor(
     trait_generics: &ast::Generics,
     forward_ty_params: Vec<ast::TyParam>,
     forward_tys: Vec<P<ast::Ty>>
-) -> (P<ast::Item>, P<ast::Ty>, P<ast::Expr>, ast::Generics) {
+) -> Result<(P<ast::Item>, P<ast::Ty>, P<ast::Expr>, ast::Generics), ()> {
     if trait_generics.ty_params.is_empty() && forward_tys.is_empty() {
-        (
+        Ok((
             builder.item().tuple_struct("__Visitor").build(),
             builder.ty().id("__Visitor"),
             builder.expr().id("__Visitor"),
             trait_generics.clone(),
-        )
+        ))
     } else {
         let placeholders : Vec<_> = trait_generics.ty_params.iter()
             .map(|t| builder.ty().id(t.ident))
@@ -187,7 +201,7 @@ fn deserialize_visitor(
         ty_params.extend(trait_generics.ty_params.into_vec());
         trait_generics.ty_params = P::from_vec(ty_params);
 
-        (
+        Ok((
             builder.item().tuple_struct("__Visitor")
                 .generics().with(trait_generics.clone()).build()
                 .with_tys({
@@ -225,7 +239,7 @@ fn deserialize_visitor(
                 })
                 .build(),
             trait_generics,
-        )
+        ))
     }
 }
 
@@ -249,10 +263,10 @@ fn deserialize_unit_struct(
     cx: &ExtCtxt,
     builder: &aster::AstBuilder,
     type_ident: Ident,
-) -> P<ast::Expr> {
+) -> Result<P<ast::Expr>, ()> {
     let type_name = builder.expr().str(type_ident);
 
-    quote_expr!(cx, {
+    Ok(quote_expr!(cx, {
         struct __Visitor;
 
         impl ::serde::de::Visitor for __Visitor {
@@ -275,7 +289,7 @@ fn deserialize_unit_struct(
         }
 
         deserializer.visit_unit_struct($type_name, __Visitor)
-    })
+    }))
 }
 
 fn deserialize_newtype_struct(
@@ -284,16 +298,15 @@ fn deserialize_newtype_struct(
     type_ident: Ident,
     impl_generics: &ast::Generics,
     ty: P<ast::Ty>,
-) -> P<ast::Expr> {
+) -> Result<P<ast::Expr>, ()> {
     let where_clause = &impl_generics.where_clause;
 
-    let (visitor_item, visitor_ty, visitor_expr, visitor_generics) =
-        deserialize_visitor(
-            builder,
-            impl_generics,
-            vec![deserializer_ty_param(builder)],
-            vec![deserializer_ty_arg(builder)],
-        );
+    let (visitor_item, visitor_ty, visitor_expr, visitor_generics) = try!(deserialize_visitor(
+        builder,
+        impl_generics,
+        vec![deserializer_ty_param(builder)],
+        vec![deserializer_ty_arg(builder)],
+    ));
 
     let visit_seq_expr = deserialize_seq(
         cx,
@@ -304,7 +317,7 @@ fn deserialize_newtype_struct(
 
     let type_name = builder.expr().str(type_ident);
 
-    quote_expr!(cx, {
+    Ok(quote_expr!(cx, {
         $visitor_item
 
         impl $visitor_generics ::serde::de::Visitor for $visitor_ty $where_clause {
@@ -327,7 +340,7 @@ fn deserialize_newtype_struct(
         }
 
         deserializer.visit_newtype_struct($type_name, $visitor_expr)
-    })
+    }))
 }
 
 fn deserialize_tuple_struct(
@@ -337,16 +350,15 @@ fn deserialize_tuple_struct(
     impl_generics: &ast::Generics,
     ty: P<ast::Ty>,
     fields: usize,
-) -> P<ast::Expr> {
+) -> Result<P<ast::Expr>, ()> {
     let where_clause = &impl_generics.where_clause;
 
-    let (visitor_item, visitor_ty, visitor_expr, visitor_generics) =
-        deserialize_visitor(
-            builder,
-            impl_generics,
-            vec![deserializer_ty_param(builder)],
-            vec![deserializer_ty_arg(builder)],
-        );
+    let (visitor_item, visitor_ty, visitor_expr, visitor_generics) = try!(deserialize_visitor(
+        builder,
+        impl_generics,
+        vec![deserializer_ty_param(builder)],
+        vec![deserializer_ty_arg(builder)],
+    ));
 
     let visit_seq_expr = deserialize_seq(
         cx,
@@ -357,7 +369,7 @@ fn deserialize_tuple_struct(
 
     let type_name = builder.expr().str(type_ident);
 
-    quote_expr!(cx, {
+    Ok(quote_expr!(cx, {
         $visitor_item
 
         impl $visitor_generics ::serde::de::Visitor for $visitor_ty $where_clause {
@@ -372,7 +384,7 @@ fn deserialize_tuple_struct(
         }
 
         deserializer.visit_tuple_struct($type_name, $fields, $visitor_expr)
-    })
+    }))
 }
 
 fn deserialize_seq(
@@ -414,7 +426,7 @@ fn deserialize_struct_as_seq(
     builder: &aster::AstBuilder,
     struct_path: ast::Path,
     fields: &[ast::StructField],
-) -> P<ast::Expr> {
+) -> Result<P<ast::Expr>, ()> {
     let let_values: Vec<P<ast::Stmt>> = (0 .. fields.len())
         .map(|i| {
             let name = builder.id(format!("__field{}", i));
@@ -437,7 +449,9 @@ fn deserialize_struct_as_seq(
                     (
                         match field.node.kind {
                             ast::NamedField(name, _) => name.clone(),
-                            ast::UnnamedField(_) => cx.bug("struct contains unnamed fields"),
+                            ast::UnnamedField(_) => {
+                                cx.span_bug(field.span, "struct contains unnamed fields")
+                            }
                         },
                         builder.expr().id(format!("__field{}", i)),
                     )
@@ -445,13 +459,13 @@ fn deserialize_struct_as_seq(
         )
         .build();
 
-    quote_expr!(cx, {
+    Ok(quote_expr!(cx, {
         $let_values
 
         try!(visitor.end());
 
         Ok($result)
-    })
+    }))
 }
 
 fn deserialize_struct(
@@ -461,35 +475,35 @@ fn deserialize_struct(
     impl_generics: &ast::Generics,
     ty: P<ast::Ty>,
     fields: &[ast::StructField],
-) -> P<ast::Expr> {
+) -> Result<P<ast::Expr>, ()> {
     let where_clause = &impl_generics.where_clause;
 
-    let (visitor_item, visitor_ty, visitor_expr, visitor_generics) = deserialize_visitor(
+    let (visitor_item, visitor_ty, visitor_expr, visitor_generics) = try!(deserialize_visitor(
         builder,
         &impl_generics,
         vec![deserializer_ty_param(builder)],
         vec![deserializer_ty_arg(builder)],
-    );
+    ));
 
     let type_path = builder.path().id(type_ident).build();
 
-    let visit_seq_expr = deserialize_struct_as_seq(
+    let visit_seq_expr = try!(deserialize_struct_as_seq(
         cx,
         builder,
         type_path.clone(),
         fields,
-    );
+    ));
 
-    let (field_visitor, fields_stmt, visit_map_expr) = deserialize_struct_visitor(
+    let (field_visitor, fields_stmt, visit_map_expr) = try!(deserialize_struct_visitor(
         cx,
         builder,
         type_path.clone(),
         fields,
-    );
+    ));
 
     let type_name = builder.expr().str(type_ident);
 
-    quote_expr!(cx, {
+    Ok(quote_expr!(cx, {
         $field_visitor
 
         $visitor_item
@@ -515,7 +529,7 @@ fn deserialize_struct(
         $fields_stmt
 
         deserializer.visit_struct($type_name, FIELDS, $visitor_expr)
-    })
+    }))
 }
 
 fn deserialize_item_enum(
@@ -525,7 +539,7 @@ fn deserialize_item_enum(
     impl_generics: &ast::Generics,
     ty: P<ast::Ty>,
     enum_def: &EnumDef,
-) -> P<ast::Expr> {
+) -> Result<P<ast::Expr>, ()> {
     let where_clause = &impl_generics.where_clause;
 
     let type_name = builder.expr().str(type_ident);
@@ -536,7 +550,7 @@ fn deserialize_item_enum(
         enum_def.variants.iter()
             .map(|variant| {
                 let expr = builder.expr().str(variant.node.name);
-                 attr::FieldAttrsBuilder::new(builder)
+                 attr::FieldAttrsBuilder::new(cx, builder)
                     .name(expr)
                     .default()
                     .build()
@@ -558,35 +572,33 @@ fn deserialize_item_enum(
     ).unwrap();
 
     // Match arms to extract a variant from a string
-    let variant_arms: Vec<_> = enum_def.variants.iter()
-        .enumerate()
-        .map(|(i, variant)| {
-            let variant_name = builder.pat().enum_()
-                .id("__Field").id(format!("__field{}", i)).build()
-                .build();
+    let mut variant_arms = vec![];
+    for (i, variant) in enum_def.variants.iter().enumerate() {
+        let variant_name = builder.pat().enum_()
+            .id("__Field").id(format!("__field{}", i)).build()
+            .build();
 
-            let expr = deserialize_variant(
-                cx,
-                builder,
-                type_ident,
-                impl_generics,
-                ty.clone(),
-                variant,
-            );
-
-            quote_arm!(cx, $variant_name => { $expr })
-        })
-        .collect();
-
-    let (visitor_item, visitor_ty, visitor_expr, visitor_generics) =
-        deserialize_visitor(
+        let expr = try!(deserialize_variant(
+            cx,
             builder,
+            type_ident,
             impl_generics,
-            vec![deserializer_ty_param(builder)],
-            vec![deserializer_ty_arg(builder)],
-        );
+            ty.clone(),
+            variant,
+        ));
 
-    quote_expr!(cx, {
+        let arm = quote_arm!(cx, $variant_name => { $expr });
+        variant_arms.push(arm);
+    }
+
+    let (visitor_item, visitor_ty, visitor_expr, visitor_generics) = try!(deserialize_visitor(
+        builder,
+        impl_generics,
+        vec![deserializer_ty_param(builder)],
+        vec![deserializer_ty_arg(builder)],
+    ));
+
+    Ok(quote_expr!(cx, {
         $variant_visitor
 
         $visitor_item
@@ -606,7 +618,7 @@ fn deserialize_item_enum(
         $variants_stmt
 
         deserializer.visit_enum($type_name, VARIANTS, $visitor_expr)
-    })
+    }))
 }
 
 fn deserialize_variant(
@@ -616,21 +628,21 @@ fn deserialize_variant(
     generics: &ast::Generics,
     ty: P<ast::Ty>,
     variant: &ast::Variant,
-) -> P<ast::Expr> {
+) -> Result<P<ast::Expr>, ()> {
     let variant_ident = variant.node.name;
 
     match variant.node.data {
         ast::VariantData::Unit(_) => {
-            quote_expr!(cx, {
+            Ok(quote_expr!(cx, {
                 try!(visitor.visit_unit());
                 Ok($type_ident::$variant_ident)
-            })
+            }))
         }
         ast::VariantData::Tuple(ref args, _) if args.len() == 1 => {
-            quote_expr!(cx, {
+            Ok(quote_expr!(cx, {
                 let val = try!(visitor.visit_newtype());
                 Ok($type_ident::$variant_ident(val))
-            })
+            }))
         }
         ast::VariantData::Tuple(ref fields, _) => {
             deserialize_tuple_variant(
@@ -665,16 +677,15 @@ fn deserialize_tuple_variant(
     generics: &ast::Generics,
     ty: P<ast::Ty>,
     fields: usize,
-) -> P<ast::Expr> {
+) -> Result<P<ast::Expr>, ()> {
     let where_clause = &generics.where_clause;
 
-    let (visitor_item, visitor_ty, visitor_expr, visitor_generics) =
-        deserialize_visitor(
-            builder,
-            generics,
-            vec![deserializer_ty_param(builder)],
-            vec![deserializer_ty_arg(builder)],
-        );
+    let (visitor_item, visitor_ty, visitor_expr, visitor_generics) = try!(deserialize_visitor(
+        builder,
+        generics,
+        vec![deserializer_ty_param(builder)],
+        vec![deserializer_ty_arg(builder)],
+    ));
 
     let visit_seq_expr = deserialize_seq(
         cx,
@@ -683,7 +694,7 @@ fn deserialize_tuple_variant(
         fields,
     );
 
-    quote_expr!(cx, {
+    Ok(quote_expr!(cx, {
         $visitor_item
 
         impl $visitor_generics ::serde::de::Visitor for $visitor_ty $where_clause {
@@ -697,7 +708,7 @@ fn deserialize_tuple_variant(
         }
 
         visitor.visit_tuple($fields, $visitor_expr)
-    })
+    }))
 }
 
 fn deserialize_struct_variant(
@@ -708,7 +719,7 @@ fn deserialize_struct_variant(
     generics: &ast::Generics,
     ty: P<ast::Ty>,
     fields: &[ast::StructField],
-) -> P<ast::Expr> {
+) -> Result<P<ast::Expr>, ()> {
     let where_clause = &generics.where_clause;
 
     let type_path = builder.path()
@@ -716,29 +727,28 @@ fn deserialize_struct_variant(
         .id(variant_ident)
         .build();
 
-    let visit_seq_expr = deserialize_struct_as_seq(
+    let visit_seq_expr = try!(deserialize_struct_as_seq(
         cx,
         builder,
         type_path.clone(),
         fields,
-    );
+    ));
 
-    let (field_visitor, fields_stmt, field_expr) = deserialize_struct_visitor(
+    let (field_visitor, fields_stmt, field_expr) = try!(deserialize_struct_visitor(
         cx,
         builder,
         type_path,
         fields,
-    );
+    ));
 
-    let (visitor_item, visitor_ty, visitor_expr, visitor_generics) =
-        deserialize_visitor(
-            builder,
-            generics,
-            vec![deserializer_ty_param(builder)],
-            vec![deserializer_ty_arg(builder)],
-        );
+    let (visitor_item, visitor_ty, visitor_expr, visitor_generics) = try!(deserialize_visitor(
+        builder,
+        generics,
+        vec![deserializer_ty_param(builder)],
+        vec![deserializer_ty_arg(builder)],
+    ));
 
-    quote_expr!(cx, {
+    Ok(quote_expr!(cx, {
         $field_visitor
 
         $visitor_item
@@ -764,7 +774,7 @@ fn deserialize_struct_variant(
         $fields_stmt
 
         visitor.visit_struct(FIELDS, $visitor_expr)
-    })
+    }))
 }
 
 fn deserialize_field_visitor(
@@ -920,19 +930,19 @@ fn deserialize_struct_visitor(
     builder: &aster::AstBuilder,
     struct_path: ast::Path,
     fields: &[ast::StructField],
-) -> (Vec<P<ast::Item>>, P<ast::Stmt>, P<ast::Expr>) {
+) -> Result<(Vec<P<ast::Item>>, P<ast::Stmt>, P<ast::Expr>), ()> {
     let field_visitor = deserialize_field_visitor(
         cx,
         builder,
-        field::struct_field_attrs(cx, builder, fields),
+        try!(field::struct_field_attrs(cx, builder, fields)),
     );
 
-    let visit_map_expr = deserialize_map(
+    let visit_map_expr = try!(deserialize_map(
         cx,
         builder,
         struct_path,
         fields,
-    );
+    ));
 
     let fields_expr = builder.expr().addr_of().slice()
         .with_exprs(
@@ -940,7 +950,9 @@ fn deserialize_struct_visitor(
                 .map(|field| {
                     match field.node.kind {
                         ast::NamedField(name, _) => builder.expr().str(name),
-                        ast::UnnamedField(_) => panic!("struct contains unnamed fields"),
+                        ast::UnnamedField(_) => {
+                            cx.span_bug(field.span, "struct contains unnamed fields")
+                        }
                     }
                 })
         )
@@ -950,7 +962,7 @@ fn deserialize_struct_visitor(
         const FIELDS: &'static [&'static str] = $fields_expr;
     ).unwrap();
 
-    (field_visitor, fields_stmt, visit_map_expr)
+    Ok((field_visitor, fields_stmt, visit_map_expr))
 }
 
 fn deserialize_map(
@@ -958,7 +970,7 @@ fn deserialize_map(
     builder: &aster::AstBuilder,
     struct_path: ast::Path,
     fields: &[ast::StructField],
-) -> P<ast::Expr> {
+) -> Result<P<ast::Expr>, ()> {
     // Create the field names for the fields.
     let field_names: Vec<ast::Ident> = (0 .. fields.len())
         .map(|i| builder.id(format!("__field{}", i)))
@@ -980,8 +992,10 @@ fn deserialize_map(
         })
         .collect();
 
+    let field_attrs = try!(field::struct_field_attrs(cx, builder, fields));
+
     let extract_values: Vec<P<ast::Stmt>> = field_names.iter()
-        .zip(field::struct_field_attrs(cx, builder, fields).iter())
+        .zip(field_attrs.iter())
         .map(|(field_name, field_attr)| {
             let missing_expr = if field_attr.use_default() {
                 quote_expr!(cx, ::std::default::Default::default())
@@ -1024,7 +1038,9 @@ fn deserialize_map(
                     (
                         match field.node.kind {
                             ast::NamedField(name, _) => name.clone(),
-                            ast::UnnamedField(_) => panic!("struct contains unnamed fields"),
+                            ast::UnnamedField(_) => {
+                                cx.span_bug(field.span, "struct contains unnamed fields")
+                            }
                         },
                         builder.expr().id(field_name),
                     )
@@ -1032,7 +1048,7 @@ fn deserialize_map(
         )
         .build();
 
-    quote_expr!(cx, {
+    Ok(quote_expr!(cx, {
         $let_values
 
         while let Some(key) = try!(visitor.visit_key()) {
@@ -1046,5 +1062,5 @@ fn deserialize_map(
         try!(visitor.end());
 
         Ok($result)
-    })
+    }))
 }

serde_codegen/src/field.rs

@@ -2,16 +2,29 @@ use syntax::ast;
 use syntax::ext::base::ExtCtxt;
 
 use aster;
-use attr::{FieldAttrs, FieldAttrsBuilder};
+use attr;
 
 pub fn struct_field_attrs(
-    _cx: &ExtCtxt,
+    cx: &ExtCtxt,
     builder: &aster::AstBuilder,
     fields: &[ast::StructField],
-) -> Vec<FieldAttrs> {
-    fields.iter()
-        .map(|field| {
-            FieldAttrsBuilder::new(builder).field(field).build()
-        })
-        .collect()
+) -> Result<Vec<attr::FieldAttrs>, ()> {
+    let mut attrs = vec![];
+    for field in fields {
+        let builder = attr::FieldAttrsBuilder::new(cx, builder);
+        let builder = try!(builder.field(field));
+        let attr = builder.build();
+        attrs.push(attr);
+    }
+
+    Ok(attrs)
+}
+
+pub fn container_attrs(
+    cx: &ExtCtxt,
+    container: &ast::Item,
+) -> Result<attr::ContainerAttrs, ()> {
+    let builder = attr::ContainerAttrsBuilder::new(cx);
+    let builder = try!(builder.attrs(container.attrs()));
+    Ok(builder.build())
 }

serde_codegen/src/lib.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(feature = "nightly", plugin(clippy))]
+#![cfg_attr(feature = "nightly", allow(used_underscore_binding))]
 #![cfg_attr(not(feature = "with-syntex"), feature(rustc_private, plugin))]
 #![cfg_attr(not(feature = "with-syntex"), plugin(quasi_macros))]
 
@@ -16,6 +18,9 @@ extern crate syntax;
 #[cfg(not(feature = "with-syntex"))]
 extern crate rustc_plugin;
 
+#[cfg(not(feature = "with-syntex"))]
+use syntax::feature_gate::AttributeType;
+
 #[cfg(feature = "with-syntex")]
 include!(concat!(env!("OUT_DIR"), "/lib.rs"));
 
@@ -70,4 +75,6 @@ pub fn register(reg: &mut rustc_plugin::Registry) {
         syntax::parse::token::intern("derive_Deserialize"),
         syntax::ext::base::MultiDecorator(
             Box::new(de::expand_derive_deserialize)));
+
+    reg.register_attribute("serde".to_owned(), AttributeType::Normal);
 }

serde_codegen/src/ser.rs

@@ -11,7 +11,7 @@ use syntax::ext::base::{Annotatable, ExtCtxt};
 use syntax::ext::build::AstBuilder;
 use syntax::ptr::P;
 
-use field::struct_field_attrs;
+use field;
 
 pub fn expand_derive_serialize(
     cx: &mut ExtCtxt,
@@ -25,7 +25,7 @@ pub fn expand_derive_serialize(
         _ => {
             cx.span_err(
                 meta_item.span,
-                "`derive` may only be applied to structs and enums");
+                "`#[derive(Serialize)]` may only be applied to structs and enums");
             return;
         }
     };
@@ -35,7 +35,12 @@ pub fn expand_derive_serialize(
     let generics = match item.node {
         ast::ItemStruct(_, ref generics) => generics,
         ast::ItemEnum(_, ref generics) => generics,
-        _ => cx.bug("expected ItemStruct or ItemEnum in #[derive(Serialize)]")
+        _ => {
+            cx.span_err(
+                meta_item.span,
+                "`#[derive(Serialize)]` may only be applied to structs and enums");
+            return;
+        }
     };
 
     let impl_generics = builder.from_generics(generics.clone())
@@ -48,13 +53,13 @@ pub fn expand_derive_serialize(
         .segment(item.ident).with_generics(impl_generics.clone()).build()
         .build();
 
-    let body = serialize_body(
-        cx,
-        &builder,
-        &item,
-        &impl_generics,
-        ty.clone(),
-    );
+    let body = match serialize_body(cx, &builder, &item, &impl_generics, ty.clone()) {
+        Ok(body) => body,
+        Err(()) => {
+            // An error occured, but it should have been reported already.
+            return;
+        }
+    };
 
     let where_clause = &impl_generics.where_clause;
 
@@ -77,7 +82,11 @@ fn serialize_body(
     item: &Item,
     impl_generics: &ast::Generics,
     ty: P<ast::Ty>,
-) -> P<ast::Expr> {
+) -> Result<P<ast::Expr>, ()> {
+    // Note: While we don't have any container attributes, we still want to try to
+    // parse them so we can report a proper error if we get passed an unknown attribute.
+    let _ = try!(field::container_attrs(cx, item));
+
     match item.node {
         ast::ItemStruct(ref variant_data, _) => {
             serialize_item_struct(
@@ -86,6 +95,7 @@ fn serialize_body(
                 item,
                 impl_generics,
                 ty,
+                item.span,
                 variant_data,
             )
         }
@@ -99,7 +109,10 @@ fn serialize_body(
                 enum_def,
             )
         }
-        _ => cx.bug("expected ItemStruct or ItemEnum in #[derive(Serialize)]")
+        _ => {
+            cx.span_bug(item.span,
+                        "expected ItemStruct or ItemEnum in #[derive(Serialize)]");
+        }
     }
 }
 
@@ -109,8 +122,9 @@ fn serialize_item_struct(
     item: &Item,
     impl_generics: &ast::Generics,
     ty: P<ast::Ty>,
+    span: Span,
     variant_data: &ast::VariantData,
-) -> P<ast::Expr> {
+) -> Result<P<ast::Expr>, ()> {
     match *variant_data {
         ast::VariantData::Unit(_) => {
             serialize_unit_struct(
@@ -128,7 +142,7 @@ fn serialize_item_struct(
         }
         ast::VariantData::Tuple(ref fields, _) => {
             if fields.iter().any(|field| !field.node.kind.is_unnamed()) {
-                cx.bug("tuple struct has named fields")
+                cx.span_bug(span, "tuple struct has named fields")
             }
 
             serialize_tuple_struct(
@@ -142,7 +156,7 @@ fn serialize_item_struct(
         }
         ast::VariantData::Struct(ref fields, _) => {
             if fields.iter().any(|field| field.node.kind.is_unnamed()) {
-                cx.bug("struct has unnamed fields")
+                cx.span_bug(span, "struct has unnamed fields")
             }
 
             serialize_struct(
@@ -161,20 +175,24 @@ fn serialize_unit_struct(
     cx: &ExtCtxt,
     builder: &aster::AstBuilder,
     type_ident: Ident
-) -> P<ast::Expr> {
+) -> Result<P<ast::Expr>, ()> {
     let type_name = builder.expr().str(type_ident);
 
-    quote_expr!(cx, serializer.visit_unit_struct($type_name))
+    Ok(quote_expr!(cx,
+        serializer.visit_unit_struct($type_name)
+    ))
 }
 
 fn serialize_newtype_struct(
     cx: &ExtCtxt,
     builder: &aster::AstBuilder,
     type_ident: Ident
-) -> P<ast::Expr> {
+) -> Result<P<ast::Expr>, ()> {
     let type_name = builder.expr().str(type_ident);
 
-    quote_expr!(cx, serializer.visit_newtype_struct($type_name, &self.0))
+    Ok(quote_expr!(cx,
+        serializer.visit_newtype_struct($type_name, &self.0)
+    ))
 }
 
 fn serialize_tuple_struct(
@@ -184,7 +202,7 @@ fn serialize_tuple_struct(
     impl_generics: &ast::Generics,
     ty: P<ast::Ty>,
     fields: usize,
-) -> P<ast::Expr> {
+) -> Result<P<ast::Expr>, ()> {
     let (visitor_struct, visitor_impl) = serialize_tuple_struct_visitor(
         cx,
         builder,
@@ -199,7 +217,7 @@ fn serialize_tuple_struct(
 
     let type_name = builder.expr().str(type_ident);
 
-    quote_expr!(cx, {
+    Ok(quote_expr!(cx, {
         $visitor_struct
         $visitor_impl
         serializer.visit_tuple_struct($type_name, Visitor {
@@ -207,7 +225,7 @@ fn serialize_tuple_struct(
             state: 0,
             _structure_ty: ::std::marker::PhantomData::<&$ty>,
         })
-    })
+    }))
 }
 
 fn serialize_struct(
@@ -217,8 +235,13 @@ fn serialize_struct(
     impl_generics: &ast::Generics,
     ty: P<ast::Ty>,
     fields: &[ast::StructField],
-) -> P<ast::Expr> {
-    let (visitor_struct, visitor_impl) = serialize_struct_visitor(
+) -> Result<P<ast::Expr>, ()> {
+    let value_exprs = fields.iter().map(|field| {
+        let name = field.node.ident().expect("struct has unnamed field");
+        quote_expr!(cx, &self.value.$name)
+    });
+
+    let (visitor_struct, visitor_impl) = try!(serialize_struct_visitor(
         cx,
         builder,
         ty.clone(),
@@ -228,15 +251,12 @@ fn serialize_struct(
             .build_ty(ty.clone()),
         fields,
         impl_generics,
-        fields.iter().map(|field| {
-            let name = field.node.ident().expect("struct has unnamed field");
-            quote_expr!(cx, &self.value.$name)
-        })
-    );
+        value_exprs,
+    ));
 
     let type_name = builder.expr().str(type_ident);
 
-    quote_expr!(cx, {
+    Ok(quote_expr!(cx, {
         $visitor_struct
         $visitor_impl
         serializer.visit_struct($type_name, Visitor {
@@ -244,7 +264,7 @@ fn serialize_struct(
             state: 0,
             _structure_ty: ::std::marker::PhantomData::<&$ty>,
         })
-    })
+    }))
 }
 
 fn serialize_item_enum(
@@ -254,27 +274,28 @@ fn serialize_item_enum(
     impl_generics: &ast::Generics,
     ty: P<ast::Ty>,
     enum_def: &ast::EnumDef,
-) -> P<ast::Expr> {
-    let arms: Vec<ast::Arm> = enum_def.variants.iter()
-        .enumerate()
-        .map(|(variant_index, variant)| {
-            serialize_variant(
-                cx,
-                builder,
-                type_ident,
-                impl_generics,
-                ty.clone(),
-                variant,
-                variant_index,
-            )
-        })
-        .collect();
+) -> Result<P<ast::Expr>, ()> {
+    let mut arms = vec![];
 
-    quote_expr!(cx,
+    for (variant_index, variant) in enum_def.variants.iter().enumerate() {
+        let arm = try!(serialize_variant(
+            cx,
+            builder,
+            type_ident,
+            impl_generics,
+            ty.clone(),
+            variant,
+            variant_index,
+        ));
+
+        arms.push(arm);
+    }
+
+    Ok(quote_expr!(cx,
         match *self {
             $arms
         }
-    )
+    ))
 }
 
 fn serialize_variant(
@@ -285,7 +306,7 @@ fn serialize_variant(
     ty: P<ast::Ty>,
     variant: &ast::Variant,
     variant_index: usize,
-) -> ast::Arm {
+) -> Result<ast::Arm, ()> {
     let type_name = builder.expr().str(type_ident);
     let variant_ident = variant.node.name;
     let variant_name = builder.expr().str(variant_ident);
@@ -296,7 +317,7 @@ fn serialize_variant(
                 .id(type_ident).id(variant_ident).build()
                 .build();
 
-            quote_arm!(cx,
+            Ok(quote_arm!(cx,
                 $pat => {
                     ::serde::ser::Serializer::visit_unit_variant(
                         serializer,
@@ -305,7 +326,7 @@ fn serialize_variant(
                         $variant_name,
                     )
                 }
-            )
+            ))
         },
         ast::VariantData::Tuple(ref fields, _) if fields.len() == 1 => {
             let field = builder.id("__simple_value");
@@ -314,7 +335,8 @@ fn serialize_variant(
                 .id(type_ident).id(variant_ident).build()
                 .with_pats(Some(field).into_iter())
                 .build();
-            quote_arm!(cx,
+
+            Ok(quote_arm!(cx,
                 $pat => {
                     ::serde::ser::Serializer::visit_newtype_variant(
                         serializer,
@@ -324,7 +346,7 @@ fn serialize_variant(
                         __simple_value,
                     )
                 }
-            )
+            ))
         },
         ast::VariantData::Tuple(ref fields, _) => {
             let field_names: Vec<ast::Ident> = (0 .. fields.len())
@@ -351,7 +373,9 @@ fn serialize_variant(
                 field_names,
             );
 
-            quote_arm!(cx, $pat => { $expr })
+            Ok(quote_arm!(cx,
+                $pat => { $expr }
+            ))
         }
         ast::VariantData::Struct(ref fields, _) => {
             let field_names: Vec<_> = (0 .. fields.len())
@@ -367,7 +391,7 @@ fn serialize_variant(
                             let name = match field.node.kind {
                                 ast::NamedField(name, _) => name,
                                 ast::UnnamedField(_) => {
-                                    cx.bug("struct variant has unnamed fields")
+                                    cx.span_bug(field.span, "struct variant has unnamed fields")
                                 }
                             };
 
@@ -376,7 +400,7 @@ fn serialize_variant(
                 )
                 .build();
 
-            let expr = serialize_struct_variant(
+            let expr = try!(serialize_struct_variant(
                 cx,
                 builder,
                 type_name,
@@ -386,9 +410,11 @@ fn serialize_variant(
                 ty,
                 fields,
                 field_names,
-            );
+            ));
 
-            quote_arm!(cx, $pat => { $expr })
+            Ok(quote_arm!(cx,
+                $pat => { $expr }
+            ))
         }
     }
 }
@@ -453,7 +479,7 @@ fn serialize_struct_variant(
     structure_ty: P<ast::Ty>,
     fields: &[ast::StructField],
     field_names: Vec<Ident>,
-) -> P<ast::Expr> {
+) -> Result<P<ast::Expr>, ()> {
     let value_ty = builder.ty().tuple()
         .with_tys(
             fields.iter().map(|field| {
@@ -473,7 +499,7 @@ fn serialize_struct_variant(
         )
         .build();
 
-    let (visitor_struct, visitor_impl) = serialize_struct_visitor(
+    let (visitor_struct, visitor_impl) = try!(serialize_struct_visitor(
         cx,
         builder,
         structure_ty.clone(),
@@ -485,9 +511,9 @@ fn serialize_struct_variant(
                 .tup_field(i)
                 .field("value").self_()
         })
-    );
+    ));
 
-    quote_expr!(cx, {
+    Ok(quote_expr!(cx, {
         $visitor_struct
         $visitor_impl
         serializer.visit_struct_variant($type_name, $variant_index, $variant_name, Visitor {
@@ -495,7 +521,7 @@ fn serialize_struct_variant(
             state: 0,
             _structure_ty: ::std::marker::PhantomData::<&$structure_ty>,
         })
-    })
+    }))
 }
 
 fn serialize_tuple_struct_visitor(
@@ -573,12 +599,12 @@ fn serialize_struct_visitor<I>(
     fields: &[ast::StructField],
     generics: &ast::Generics,
     value_exprs: I,
-) -> (P<ast::Item>, P<ast::Item>)
+) -> Result<(P<ast::Item>, P<ast::Item>), ()>
     where I: Iterator<Item=P<ast::Expr>>,
 {
     let value_exprs = value_exprs.collect::<Vec<_>>();
 
-    let field_attrs = struct_field_attrs(cx, builder, fields);
+    let field_attrs = try!(field::struct_field_attrs(cx, builder, fields));
 
     let arms: Vec<ast::Arm> = field_attrs.iter()
         .zip(value_exprs.iter())
@@ -641,7 +667,7 @@ fn serialize_struct_visitor<I>(
         })
         .fold(quote_expr!(cx, 0), |sum, expr| quote_expr!(cx, $sum + $expr));
 
-    (
+    Ok((
         quote_item!(cx,
             struct Visitor $visitor_impl_generics $where_clause {
                 state: usize,
@@ -673,5 +699,5 @@ fn serialize_struct_visitor<I>(
                 }
             }
         ).unwrap(),
-    )
+    ))
 }

serde_macros/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde_macros"
-version = "0.6.6"
+version = "0.6.11"
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "Macros to auto-generate implementations for the serde framework"
@@ -13,9 +13,11 @@ name = "serde_macros"
 plugin = true
 
 [dependencies]
-serde_codegen = { version = "*", path = "../serde_codegen", default-features = false, features = ["nightly"] }
+clippy = "^0.0.37"
+serde_codegen = { version = "^0.6.10", path = "../serde_codegen", default-features = false, features = ["nightly"] }
 
 [dev-dependencies]
+compiletest_rs = "^0.0.11"
 num = "^0.1.27"
 rustc-serialize = "^0.3.16"
-serde = { version = "*", path = "../serde", features = ["nightly", "num-impls"] }
+serde = { version = "^0.6.10", path = "../serde", features = ["nightly", "num-impls"] }

serde_macros/benches/bench.rs

@@ -1,4 +1,5 @@
 #![feature(custom_attribute, custom_derive, plugin, test)]
+#![plugin(clippy)]
 #![plugin(serde_macros)]
 
 extern crate num;

serde_macros/src/lib.rs

@@ -1,4 +1,5 @@
-#![feature(plugin_registrar, rustc_private)]
+#![feature(plugin, plugin_registrar, rustc_private)]
+#![plugin(clippy)]
 
 extern crate serde_codegen;
 extern crate rustc_plugin;

serde_macros/tests/compile-fail/reject-unknown-attributes.rs

@@ -0,0 +1,30 @@
+#![feature(custom_attribute, custom_derive, plugin)]
+#![plugin(serde_macros)]
+
+extern crate serde;
+
+#[derive(Serialize)]
+#[serde(abc="xyz")] //~ unknown serde container attribute `abc = "xyz"`
+struct Foo {
+    x: u32,
+}
+
+#[derive(Deserialize)]
+#[serde(abc="xyz")] //~ unknown serde container attribute `abc = "xyz"`
+struct Foo {
+    x: u32,
+}
+
+#[derive(Serialize)]
+struct Foo {
+    #[serde(abc="xyz")] //~ unknown serde field attribute `abc = "xyz"`
+    x: u32,
+}
+
+#[derive(Deserialize)]
+struct Foo {
+    #[serde(abc="xyz")] //~ unknown serde field attribute `abc = "xyz"`
+    x: u32,
+}
+
+fn main() { }

serde_macros/tests/compile_tests.rs

@@ -0,0 +1,25 @@
+extern crate compiletest_rs as compiletest;
+
+use std::path::PathBuf;
+use std::env::var;
+
+fn run_mode(mode: &'static str) {
+    let mut config = compiletest::default_config();
+
+    let cfg_mode = mode.parse().ok().expect("Invalid mode");
+
+    config.target_rustcflags = Some("-L target/debug/ -L target/debug/deps/".to_owned());
+    if let Ok(name) = var::<&str>("TESTNAME") {
+        let s : String = name.to_owned();
+        config.filter = Some(s)
+    }
+    config.mode = cfg_mode;
+    config.src_base = PathBuf::from(format!("tests/{}", mode));
+
+    compiletest::run_tests(&config);
+}
+
+#[test]
+fn compile_test() {
+    run_mode("compile-fail");
+}

serde_macros/tests/test.rs

@@ -6,3 +6,5 @@ extern crate serde;
 extern crate test;
 
 include!("../../serde_tests/tests/test.rs.in");
+
+mod compile_tests;

serde_tests/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde_tests"
-version = "0.6.2"
+version = "0.6.3"
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "A generic serialization/deserialization framework"
@@ -10,16 +10,22 @@ readme = "README.md"
 keywords = ["serialization"]
 build = "build.rs"
 
+[features]
+nightly = ["clippy", "serde/nightly"]
+
 [build-dependencies]
-syntex = { version = "^0.25.0" }
-syntex_syntax = { version = "^0.25.0" }
+syntex = { version = "^0.26.0" }
+syntex_syntax = { version = "^0.26.0" }
 serde_codegen = { version = "*", path = "../serde_codegen", features = ["with-syntex"] }
 
 [dev-dependencies]
 num = "^0.1.27"
 rustc-serialize = "^0.3.16"
 serde = { version = "*", path = "../serde", features = ["num-impls"] }
-syntex = "^0.25.0"
+syntex = "^0.26.0"
+
+[dependencies]
+clippy = { version = "^0.0.37", optional = true }
 
 [[test]]
 name = "test"

serde_tests/benches/bench.rs

@@ -1,4 +1,6 @@
 #![feature(test)]
+#![cfg_attr(feature = "nightly", feature(plugin))]
+#![cfg_attr(feature = "nightly", plugin(clippy))]
 
 extern crate num;
 extern crate rustc_serialize;

serde_tests/benches/bench_enum.rs

@@ -415,7 +415,7 @@ fn bench_decoder_dog(b: &mut Bencher) {
 #[bench]
 fn bench_decoder_frog(b: &mut Bencher) {
     b.iter(|| {
-        let animal = Animal::Frog("Henry".to_string(), 349);
+        let animal = Animal::Frog("Henry".to_owned(), 349);
 
         let mut d = decoder::AnimalDecoder::new(animal.clone());
         let value: Animal = Decodable::decode(&mut d).unwrap();
@@ -439,7 +439,7 @@ fn bench_deserializer_dog(b: &mut Bencher) {
 #[bench]
 fn bench_deserializer_frog(b: &mut Bencher) {
     b.iter(|| {
-        let animal = Animal::Frog("Henry".to_string(), 349);
+        let animal = Animal::Frog("Henry".to_owned(), 349);
 
         let mut d = deserializer::AnimalDeserializer::new(animal.clone());
         let value: Animal = Deserialize::deserialize(&mut d).unwrap();

serde_tests/benches/bench_struct.rs

@@ -614,7 +614,7 @@ mod deserializer {
 fn bench_decoder_0_0(b: &mut Bencher) {
     b.iter(|| {
         let mut map = HashMap::new();
-        map.insert("abc".to_string(), Some('c'));
+        map.insert("abc".to_owned(), Some('c'));
 
         let outer = Outer {
             inner: vec!(),
@@ -653,11 +653,11 @@ fn bench_decoder_1_0(b: &mut Bencher) {
 fn bench_decoder_1_5(b: &mut Bencher) {
     b.iter(|| {
         let mut map = HashMap::new();
-        map.insert("1".to_string(), Some('a'));
-        map.insert("2".to_string(), None);
-        map.insert("3".to_string(), Some('b'));
-        map.insert("4".to_string(), None);
-        map.insert("5".to_string(), Some('c'));
+        map.insert("1".to_owned(), Some('a'));
+        map.insert("2".to_owned(), None);
+        map.insert("3".to_owned(), Some('b'));
+        map.insert("4".to_owned(), None);
+        map.insert("5".to_owned(), Some('c'));
 
         let outer = Outer {
             inner: vec!(
@@ -716,11 +716,11 @@ fn bench_deserializer_1_0(b: &mut Bencher) {
 fn bench_deserializer_1_5(b: &mut Bencher) {
     b.iter(|| {
         let mut map = HashMap::new();
-        map.insert("1".to_string(), Some('a'));
-        map.insert("2".to_string(), None);
-        map.insert("3".to_string(), Some('b'));
-        map.insert("4".to_string(), None);
-        map.insert("5".to_string(), Some('c'));
+        map.insert("1".to_owned(), Some('a'));
+        map.insert("2".to_owned(), None);
+        map.insert("3".to_owned(), Some('b'));
+        map.insert("4".to_owned(), None);
+        map.insert("5".to_owned(), Some('c'));
 
         let outer = Outer {
             inner: vec!(

serde_tests/tests/test.rs

@@ -1,3 +1,6 @@
+#![cfg_attr(feature = "nightly", feature(plugin))]
+#![cfg_attr(feature = "nightly", plugin(clippy))]
+
 extern crate num;
 extern crate serde;
 

serde_tests/tests/test_de.rs

@@ -95,12 +95,12 @@ declare_tests! {
     test_char {
         'a' => vec![Token::Char('a')],
         'a' => vec![Token::Str("a")],
-        'a' => vec![Token::String("a".to_string())],
+        'a' => vec![Token::String("a".to_owned())],
     }
     test_string {
-        "abc".to_string() => vec![Token::Str("abc")],
-        "abc".to_string() => vec![Token::String("abc".to_string())],
-        "a".to_string() => vec![Token::Char('a')],
+        "abc".to_owned() => vec![Token::Str("abc")],
+        "abc".to_owned() => vec![Token::String("abc".to_owned())],
+        "a".to_owned() => vec![Token::Char('a')],
     }
     test_option {
         None::<i32> => vec![Token::Unit],

serde_tests/tests/test_ser.rs

@@ -63,7 +63,7 @@ declare_ser_tests! {
     }
     test_str {
         "abc" => &[Token::Str("abc")],
-        "abc".to_string() => &[Token::Str("abc")],
+        "abc".to_owned() => &[Token::Str("abc")],
     }
     test_option {
         None::<i32> => &[Token::Option(false)],

serde_tests/tests/token.rs

@@ -325,7 +325,7 @@ impl de::Error for Error {
     fn end_of_stream() -> Error { Error::EndOfStreamError }
 
     fn unknown_field(field: &str) -> Error {
-        Error::UnknownFieldError(field.to_string())
+        Error::UnknownFieldError(field.to_owned())
     }
 
     fn missing_field(field: &'static str) -> Error {
@@ -379,7 +379,6 @@ impl<I> de::Deserializer for Deserializer<I>
     fn visit<V>(&mut self, mut visitor: V) -> Result<V::Value, Error>
         where V: de::Visitor,
     {
-        println!("visit {:?}", self.tokens.peek());
         match self.tokens.next() {
             Some(Token::Bool(v)) => visitor.visit_bool(v),
             Some(Token::Isize(v)) => visitor.visit_isize(v),