Use exec_tools for genrule so that any genrules in the transitive deps
of out_jar may use python 3 (if those genrules use exec_tools and a
PY3 binary).  With tools= then every genrule in transitive deps is forced
to host config and uses python 2.
@@ -114,5 +114,5 @@ def j2cl_generate_jsunit_suite(name, test_class, deps, tags = []):
]),
testonly = 1,
tags = ["manual", "notap"],
- tools = [out_jar],
+ exec_tools = [out_jar],
)
