Bump to the latest nightly

We were affected by breaking changes with how struct fields are
represented. Now that I can get the tests compiling, I noticed that I
implemented the `Option` impl for specialization incorrectly.

.travis.yml

@@ -4,7 +4,7 @@ dist: trusty
 rust:
   - stable
   - beta
-  - nightly-2016-04-01
+  - nightly-2016-04-07
   - nightly
 addons:
   postgresql: '9.4'

diesel/src/types/specialization_impls.rs

@@ -5,6 +5,7 @@ impl<T, ST, DB> FromSqlRow<Nullable<ST>, DB> for Option<T> where
 {
     default fn build_from_row<R: Row<DB>>(row: &mut R) -> Result<Self, Box<Error+Send+Sync>> {
         if row.next_is_null(1) {
+            row.take();
             Ok(None)
         } else {
             T::build_from_row(row).map(Some)

diesel_codegen/src/associations/belongs_to.rs

@@ -80,7 +80,9 @@ impl<'a, 'b> BelongsToAssociationBuilder<'a, 'b> {
     }
 
     fn foreign_key_type(&self) -> P<ast::Ty> {
-        self.model.attr_named(self.foreign_key_name())
+        let name = self.foreign_key_name();
+        self.model.attr_named(name)
+            .expect(&format!("Couldn't find an attr named {}", name))
             .ty.clone()
     }
 

diesel_codegen/src/attr.rs

@@ -14,10 +14,10 @@ pub struct Attr {
 
 impl Attr {
     pub fn from_struct_field(cx: &mut ExtCtxt, field: &ast::StructField) -> Option<Self> {
-        let field_name = field.node.ident();
+        let field_name = field.ident;
         let column_name =
-            str_value_of_attr_with_name(cx, &field.node.attrs, "column_name");
+            str_value_of_attr_with_name(cx, &field.attrs, "column_name");
-        let ty = field.node.ty.clone();
+        let ty = field.ty.clone();
 
         match (column_name, field_name) {
             (Some(column_name), f) => Some(Attr {

diesel_codegen/src/model.rs

@@ -47,10 +47,16 @@ impl Model {
         })
     }
 
-    pub fn attr_named(&self, name: ast::Ident) -> &Attr {
+    pub fn attr_named(&self, name: ast::Ident) -> Option<&Attr> {
         self.attrs.iter().find(|attr| {
-            attr.field_name == Some(name)
+            attr.field_name.map(|f| f.name) == Some(name.name)
-        }).expect(&format!("Couldn't find an attr named {}", name))
+        })
+    }
+
+    pub fn attr_for_column(&self, name: ast::Ident) -> Option<&Attr> {
+        self.attrs.iter().find(|attr| {
+            attr.column_name.name == name.name
+        })
     }
 }
 

diesel_codegen/src/update.rs

@@ -91,7 +91,7 @@ fn changeset_impl(
     let ref struct_name = model.ty;
     let pk = model.primary_key_name();
     let table_name = options.table_name;
-    let attrs_for_changeset = model.attrs.iter().filter(|a| a.column_name != pk)
+    let attrs_for_changeset = model.attrs.iter().filter(|a| a.column_name.name != pk.name)
         .collect::<Vec<_>>();
     let changeset_ty = cx.ty(span, TyKind::Tup(
         attrs_for_changeset.iter()
@@ -127,7 +127,7 @@ fn save_changes_impl(
     let sql_type = cx.path(span, vec![options.table_name, str_to_ident("SqlType")]);
     let table = cx.path(span, vec![options.table_name, str_to_ident("table")]);
     let mut result = Vec::new();
-    if let Some(pk) = model.attrs.iter().find(|a| a.column_name == pk) {
+    if let Some(pk) = model.attr_for_column(pk) {
         let pk_field = pk.field_name.unwrap();
         if cfg!(feature = "postgres") {
             result.push(quote_item!(cx,

diesel_tests/tests/types.rs

@@ -377,7 +377,6 @@ fn third_party_crates_can_add_new_types() {
         }
     }
 
-    #[cfg(not(feature = "unstable"))]
     impl FromSqlRow<MyInt, Pg> for i32 {
         fn build_from_row<R: ::diesel::row::Row<Pg>>(row: &mut R) -> Result<Self, Box<Error+Send+Sync>> {
             FromSql::<MyInt, Pg>::from_sql(row.take())