BUG #14265: inserting multiple rows via array notation gives error

The following bug has been logged on the website:

Bug reference: 14265
Logged by: Nuri Boardman
Email address: ganuri(at)gmail(dot)com
PostgreSQL version: 9.4.5
Operating system: Windows 7 - 64
Description:

given a table:
create table test ( testarray int[]);

this completes as i would expect
insert into test (testarray[1], testarray[2]) values (1,2)

this gives an error
insert into test (testarray[1], testarray[2]) values (1,2),(3,4)
ERROR: multiple assignments to same column "testarray"

I'm not sure if this is supported or not, as i didn't see any documentation
about it.