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A variable name matching a statement-introducing keyword, such as "comment" or "update", caused parse failures if one tried to write a statement using that keyword. Commit bb1b8f69 already addressed this scenario for the case of variable names matching unreserved plpgsql keywords, but we didn't think about unreserved core-grammar keywords. The same heuristic (viz, it can't be a variable name unless the next token is assignment or '[') should work fine for that case too, and as a bonus the code gets shorter and less duplicative. Per bug #15555 from Feike Steenbergen. Since this hasn't been complained of before, and is easily worked around anyway, I won't risk a back-patch. Discussion: https://postgr.es/m/15555-149bbd70ddc7b4b6@postgresql.org
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.