Add implicit cargo features

Signed-off-by: Igor Gnatenko <ignatenkobrain@fedoraproject.org>

rust-uuid.spec

@@ -6,7 +6,7 @@
 
 Name:           rust-%{crate}
 Version:        0.5.1
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        Library to generate and parse UUIDs
 
 License:        MIT or ASL 2.0
@@ -32,6 +32,11 @@ BuildRequires:  (crate(sha1) >= 0.4.0 with crate(sha1) < 0.5.0)
 
 %package        devel
 Summary:        %{summary}
+# FIXME: implicit features
+# https://github.com/rust-lang-nursery/uuid/pull/111
+# https://github.com/rust-lang/cargo/issues/4911
+Provides:       crate(%{crate}/rustc-serialize) = %{version}
+Provides:       crate(%{crate}/serde) = %{version}
 BuildArch:      noarch
 
 %description    devel
@@ -61,6 +66,9 @@ which use %{crate} from crates.io.
 %{cargo_registry}/%{crate}-%{version}/
 
 %changelog
+* Sun Jan 07 2018 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 0.5.1-3
+- Add implicit cargo features
+
 * Sun Dec 31 2017 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 0.5.1-2
 - Bump rand to 0.4
 - Bump sha1 to 0.4