fix(codegen): Take into account default=... when skip_deserializing

serde_codegen/src/attr.rs

@@ -249,6 +249,13 @@ impl FieldAttrs {
                     // Parse `#[serde(skip_deserializing)]`
                     ast::MetaItemKind::Word(ref name) if name == &"skip_deserializing" => {
                         field_attrs.skip_deserializing_field = true;
+
+                        // Initialize field to Default::default() unless a different
+                        // default is specified by `#[serde(default="...")]`
+                        if field_attrs.default_expr_if_missing.is_none() {
+                            let default_expr = builder.expr().default();
+                            field_attrs.default_expr_if_missing = Some(default_expr);
+                        }
                     }
 
                     // Parse `#[serde(skip_serializing_if="...")]`

serde_codegen/src/de.rs

@@ -437,7 +437,7 @@ fn deserialize_struct_as_seq(
         .map(|(i, &(_, ref attrs))| {
             let name = builder.id(format!("__field{}", i));
             if attrs.skip_deserializing_field() {
-                let default = builder.expr().default();
+                let default = attrs.expr_is_missing();
                 quote_stmt!(cx,
                     let $name = $default;
                 ).unwrap()
@@ -1103,7 +1103,7 @@ fn deserialize_map(
                             }
                         },
                         if attrs.skip_deserializing_field() {
-                            builder.expr().default()
+                            attrs.expr_is_missing()
                         } else {
                             builder.expr().id(name)
                         }