BUG #15606: Postgres incorrectly returns syntax error when using WITHclacuse

The following bug has been logged on the website:

Bug reference:      15606
Logged by:          Rikke Hammer
Email address:      newsx@outlook.com
PostgreSQL version: 11.1
Operating system:   Windows 10 Home  version1803 x64
Description:

I get a syntax error when I try to use a WITH clause in a query. Below is a
simple test query. It (as as well as any other WITH clause query I do,
creates the following error:

          SQL Error [42601]: ERROR: syntax error at end of input
          Position: 53
           ERROR: syntax error at end of input
           Position: 53
           ERROR: syntax error at end of input
           Position: 53


CREATE TABLE employees (
 employee_id serial PRIMARY KEY,
 full_name VARCHAR NOT NULL,
 manager_id INT
);

INSERT INTO employees (
 employee_id,
 full_name,
 manager_id
)
VALUES
 (1, 'Michael North', NULL),
 (2, 'Megan Berry', 1),
 (3, 'Sarah Berry', 1),
 (4, 'Zoe Black', 1),
 (5, 'Tim James', 1),
 (6, 'Bella Tucker', 2),
 (7, 'Ryan Metcalfe', 2);
 

WITH emp AS (
select * from rikke_hammer.employees)