dev-python/typing-extensions: Add typing-extensions 3.7.4.1 from upstream

Copied from https://github.com/gentoo/gentoo.git at commit
82f12930ff6f90b237815b66a2dc93960bac9182 with KEYWORDS replaced with
"*".

BUG=b:162009542
TEST=sudo emerge mypy

Change-Id: I8ac3a89951b6509078c78e2ee569aa376d19fc88
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2316393
Tested-by: Tom Hughes <tomhughes@chromium.org>
Auto-Submit: Tom Hughes <tomhughes@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Tom Hughes <tomhughes@chromium.org>
diff --git a/dev-python/typing-extensions/Manifest b/dev-python/typing-extensions/Manifest
new file mode 100644
index 0000000..8ebd7ee
--- /dev/null
+++ b/dev-python/typing-extensions/Manifest
@@ -0,0 +1 @@
+DIST typing_extensions-3.7.4.1.tar.gz 36357 BLAKE2B 69a1dc0d86c73beb54c5b727ae0fa71a8891e729895a928be48bad49d71858d2e1fd52e029fc7f129a6990e52587eddccff985ea902cfb392534f3a299e52d84 SHA512 ef66388d035bf69f2f3f0ce5708bfb8c2284392cc9ce1804f8ad47dc1adf021637e779325d2cbb30ee76b4408defb1aa51fd2ea8cab88de2d515ab4f543c9a6f
diff --git a/dev-python/typing-extensions/metadata.xml b/dev-python/typing-extensions/metadata.xml
new file mode 100644
index 0000000..8fac39f
--- /dev/null
+++ b/dev-python/typing-extensions/metadata.xml
@@ -0,0 +1,11 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="project">
+		<email>python@gentoo.org</email>
+		<name>Python</name>
+	</maintainer>
+	<upstream>
+		<remote-id type="pypi">typing</remote-id>
+	</upstream>
+</pkgmetadata>
diff --git a/dev-python/typing-extensions/typing-extensions-3.7.4.1.ebuild b/dev-python/typing-extensions/typing-extensions-3.7.4.1.ebuild
new file mode 100644
index 0000000..dd178c5
--- /dev/null
+++ b/dev-python/typing-extensions/typing-extensions-3.7.4.1.ebuild
@@ -0,0 +1,29 @@
+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+PYTHON_COMPAT=( python3_{6,7,8} pypy3 )
+
+inherit distutils-r1
+
+MY_PN=${PN/-/_}
+MY_P=${MY_PN}-${PV}
+
+DESCRIPTION="Type Hint extensions from Python 3.7 backported to 3.5/3.6"
+HOMEPAGE="https://pypi.org/project/typing_extensions/ https://github.com/python/typing"
+SRC_URI="mirror://pypi/${MY_PN:0:1}/${MY_PN}/${MY_P}.tar.gz"
+S=${WORKDIR}/${MY_P}
+
+LICENSE="PSF-2"
+SLOT="0"
+KEYWORDS="*"
+IUSE=""
+
+DEPEND="dev-python/setuptools[${PYTHON_USEDEP}]"
+RDEPEND=""
+
+python_test() {
+	cd "${S}"/src_py3 || die
+	"${EPYTHON}" test_typing_extensions.py -v || die "tests failed under ${EPYTHON}"
+}