join_references: variable not in subplan target lists

The cited error message appears when loading the attached file (a cut-down
version of a local development version of the information schema) and then
running

select * from problem_schema.element_types;

On the last seven lines of the file I've marked a part that, when removed,
makes the problem disappear, which might give a hint.  Besides that, I'm
clueless.

My local tree was last updated June 28.

-- 
Peter Eisentraut   peter_e@gmx.net