Small query using LATERAL that segfaults Postgres - Mailing list pgsql-bugs

This small query seems to segfault Postgres.  I've tried on the
version of Postgres 11 that comes with Debian Stable and all versions
on https://www.db-fiddle.com/ including 13 (Beta).  DB Fiddle actually
says "An unexpected error occurred." but I suspect that's the
segfault.

Tom


SELECT
0
FROM (SELECT
      TRUE as "r",
      SUM(0)
      ) as "T1",
LATERAL
(SELECT TRUE as "b"
    UNION ALL
    SELECT
    "r" as "b"
    FROM (SELECT 0 ORDER BY COALESCE(0)) as "T1"
    ) as "T2"
WHERE "b"