BUG #15514: process fails on jsonb_populate_recordset query. seesimple example below

The following bug has been logged on the website:

Bug reference:      15514
Logged by:          4321ip
Email address:      4321ip@gmail.com
PostgreSQL version: 11.1
Operating system:   WindiwsServer 2012 64bit
Description:

CREATE TYPE myrowtype AS
(
    field jsonb,
    rank double precision
);
SELECT * FROM jsonb_populate_recordset(NULL :: myrowtype, '[]');

.....
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