pg_roles: unrecognized token: ":aliasname"

In an up-to-date HEAD server that was initdb'd on 12 Feb (catalog
version 200602112):

test=> SELECT * FROM pg_roles;
ERROR: unrecognized token: ":aliasname"
test=> SELECT pg_get_viewdef('pg_roles'::regclass, true);
ERROR: unrecognized token: ":aliasname"

This breaks several things, including pg_dump. A newly-initdb'd
cluster doesn't have the problem. Was something changed that should
have bumped the catalog version?

--
Michael Fuhr