BUG #13892: SELECT FALSE = FALSE = TRUE; error

The following bug has been logged on the website:

Bug reference: 13892
Logged by: Gábor Szabó
Email address: fotonszekta(at)gmail(dot)com
PostgreSQL version: 9.5.0
Operating system: Windows 10 x64
Description:

I read a post on "SELECT FALSE = FALSE = TRUE;"
(http://databaseblog.myname.nl/2016/01/when-simple-sql-can-be-complex.html)

I tried on 9.5, and it's throws an error:
ERROR: syntax error at or near "="
LINE 1: SELECT FALSE = FALSE = TRUE;
^
(the error is at the second '=')

It's maybe related to "Adjust operator precedence to match the SQL
standard"

9.1 and 9.4 returns true as excepted