BUG #13579: Server crashes after executing plpythonu function

The following bug has been logged on the website:

Bug reference:      13579
Logged by:          Paweł Michalak
Email address:      ppmichalakk@gmail.com
PostgreSQL version: 9.4.4
Operating system:   Debian 4.6.3-14
Description:

[pmichalak@asdasd ~] $ psql
psql (9.4.4)
Type "help" for help.
pmichalak=# create function a() returns setof record as $$
 return { 'a': 2, 'b': 3 }
$$ language plpythonu;
CREATE FUNCTION
pmichalak=# select * from a() as (b integer, c integer);
ERROR:  input of anonymous composite types is not implemented
CONTEXT:  while creating return value
PL/Python function "a"
pmichalak=# select * from a() as (b integer, c integer);
server closed the connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.
The connection to the server was lost. Attempting reset: Failed.

Server log:
STATEMENT:  select * from a() as (b integer, c integer);
ERROR:  syntax error at or near "," at character 30
STATEMENT:  select * from q() as (b integer, c integer);
LOG:  server process (PID 14767) was terminated by signal 11: Segmentation
fault
DETAIL:  Failed process was running: select * from a() as (b integer, c
integer);
LOG:  terminating any other active server processes