BUG #14862: create table with missing sequence bug

The following bug has been logged on the website:

Bug reference: 14862
Logged by: pgyayix
Email address: gezeala(at)gmail(dot)com
PostgreSQL version: 9.4.9
Operating system: CentOS 7
Description:

--on a fresh db:
CREATE SCHEMA testschema;

--sequence is missing
--create table fails:
CREATE TABLE testschema.sometable1 (
col1 bigint DEFAULT
nextval('missingschema.missingsequence_id1'::regclass) NOT NULL,
col2 text
);

--sequence is missing
--create table works fine:
CREATE TABLE testschema.sometable2 (
col1 bigint DEFAULT
nextval(('missingschema.missingsequence_id2'::text)::regclass) NOT NULL,
col2 text
);

Only difference is sometable2 sequence definition has ::text::regclass.

Thanks.