BUG #16547: ECPG can't CALL the procedure which has INOUT parameter

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BUG #16547: ECPG can't CALL the procedure which has INOUT parameter

apt.postgresql.org Repository Update
The following bug has been logged on the website:

Bug reference:      16547
Logged by:          yusuke egashira
Email address:      [hidden email]
PostgreSQL version: 11.8
Operating system:   Red Hat Enterprise Linux Server release 6.10

I created the procedure with INOUT parameter as :
  CREATE OR REPLACE PROCEDURE inout_proc(a in int, b inout int)
  LANGUAGE plpgsql AS $$
      b = a + b;

If I called it in ECPG by "EXEC SQL CALL inout_proc(1,2);", "SQL error: too
few arguments on line xx" is caused.

On the other hand, if the procedure don't have INOUT parameter (IN only),
"EXEC SQL CALL inout_proc(1,2);" statement succeeded.

This error seems to occur because ECPG doesn't expect the value to be
returned by CALL statement.
Is this a bug?
Or, is the current version limited to calling procedures with INOUT
parameters from ECPG?

I found this behavior in PostgreSQL 11.8 and 12.3.

Also, I found the patch[1] introducing "INTO" clause in CALL of ECPG.
However, the patch changes the EXC SQL CALL statement to always require INTO