dev-python/executing: add asttokens as optional dep

Signed-off-by: Arthur Zamarin <arthurzam@gentoo.org>

dev-python/executing/executing-1.1.1.ebuild

@@ -6,7 +6,7 @@ EAPI=8
 DISTUTILS_USE_PEP517=setuptools
 PYTHON_COMPAT=( python3_{8..11} )
 
-inherit distutils-r1
+inherit distutils-r1 optfeature
 
 DESCRIPTION="Get information about what a Python frame is currently doing"
 HOMEPAGE="
@@ -22,7 +22,6 @@ LICENSE="MIT"
 SLOT="0"
 KEYWORDS="~amd64 ~arm ~arm64 ~hppa ~ia64 ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86"
 
-# asttokens is optional runtime dep
 BDEPEND="
 	dev-python/setuptools_scm[${PYTHON_USEDEP}]
 	test? (
@@ -41,3 +40,7 @@ python_test() {
 	"${EPYTHON}" tests/test_main.py || die "Tests failed with ${EPYTHON}"
 	epytest tests/test_pytest.py
 }
+
+pkg_postinst() {
+	optfeature "getting node's source code" dev-python/asttokens
+}