dev-rust/serde_json: 1.0.4 Enable tests and feature=indexmap

Though currently, these tests are nothing more than an almost no-op
of "it compiles", as the entire test suite is stripped by upstream
during shipping, and subsequently, a whole bunch of unused
dev-dependencies are patched out to keep things simple.

Bug: serde-rs/json#578
Package-Manager: Portage-2.3.75, Repoman-2.3.16
Signed-off-by: Kent Fredric <kentnl@gentoo.org>

dev-rust/serde_json/files/serde_json-1.0.41-unused-deps.patch

@@ -0,0 +1,28 @@
+diff --git a/Cargo.toml.old b/Cargo.toml
+index 5ce911b..46aba1c 100644
+--- a/Cargo.toml.old
++++ b/Cargo.toml
+@@ -39,23 +39,6 @@ version = "1.0"
+
+ [dependencies.serde]
+ version = "1.0.60"
+-[dev-dependencies.automod]
+-version = "0.1"
+-
+-[dev-dependencies.rustversion]
+-version = "0.1"
+-
+-[dev-dependencies.serde_bytes]
+-version = "0.11"
+-
+-[dev-dependencies.serde_derive]
+-version = "1.0"
+-
+-[dev-dependencies.serde_stacker]
+-version = "0.1"
+-
+-[dev-dependencies.trybuild]
+-version = "1.0"
+
+ [features]
+ arbitrary_precision = []

dev-rust/serde_json/metadata.xml

@@ -6,4 +6,7 @@
 	</maintainer>
 	<longdescription lang="en">
 	</longdescription>
+	<use>
+		<flag name="indexmap">Require deps needed for 'indexmap' crate feature</flag>
+	</use>
 </pkgmetadata>

dev-rust/serde_json/serde_json-1.0.41.ebuild

@@ -11,10 +11,19 @@ SRC_URI="https://crates.io/api/v1/crates/${PN}/${PV}/download -> ${P}.crate"
 
 LICENSE="|| ( MIT Apache-2.0 )"
 KEYWORDS="~amd64 ~x86"
-IUSE="test"
-RESTRICT="test"
+IUSE="indexmap test"
+
+F_INDEXMAP="
+	=dev-rust/indexmap-1*:=
+"
 BDEPEND="
 	( =dev-rust/itoa-0.4*:= >=dev-rust/itoa-0.4.3 )
 	=dev-rust/ryu-1*:=
 	( =dev-rust/serde-1*:= >=dev-rust/serde-1.0.60 )
+	test? (
+		${F_INDEXMAP}
+	)
 "
+PATCHES=(
+	"${FILESDIR}/${P}-unused-deps.patch"
+)