[BUGS] Beta 10 parser error for CREATE STATISTICS IF NOT EXISTS - Mailing list pgsql-bugs

I'm not seeing an obvious error in my attempt to use CREATE STATISTICS 
IF NOT EXISTS. Given this is new, maybe there is a bug in the parser.

Sample output:
psql (10beta1)
Type "help" for help.

o365logs=# select version();                                                 version
             
 
--------------------------------------------------------------------------------
----------------------------PostgreSQL 10beta1 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623(Red Hat
4.8.5-11),64-bit
 
(1 row)

o365logs=# CREATE STATISTICS IF NOT EXISTS logs_corrtest (dependencies) ON record_type, operation FROM logs;
ERROR:  syntax error at or near "NOT"
LINE 1: CREATE STATISTICS IF NOT EXISTS logs_corrtest (dependencies)...                            ^
o365logs=# CREATE STATISTICS logs_corrtest (dependencies) ON record_type, operation FROM logs;
CREATE STATISTICS
o365logs=# DROP STATISTICS IF EXISTS logs_corrtest;
DROP STATISTICS
o365logs=# 



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