ALTER ROLE SET search_path produced by pg_dumpall gives : ERROR: syntax error at or near "$" .

This is with PostgreSQL 10.4.
How to reproduce :
postgres(at)smadev:~% psql
psql (10.4)
Type "help" for help.

Alter the role for search path :
dynacom=# ALTER ROLE amura3 SET search_path TO "$user", amuragents, public;
ALTER ROLE
dynacom=#

Verify :
postgres(at)smadev:~% psql -U amura3
Password for user amura3:
psql (10.4)
Type "help" for help.

dynacom=> show search_path ;
        search_path
---------------------------
 $user, amuragents, public
(1 row)

dynacom=>

pg_dumpall's output :
ALTER ROLE amura3 SET search_path TO $user, amuragents, public;

psql -f pg_dumpall_out.sql :
dynacom=# ALTER ROLE amura3 SET search_path TO $user, amuragents, public;
ERROR:  syntax error at or near "$"

Is this a bug or am I missing something ?

--
Achilleas Mantzios
IT DEV Lead
IT DEPT
Dynacom Tankers Mgmt