BUG #1875: Function parameter names clash with table column names

The following bug has been logged online:

Bug reference:      1875
Logged by:          Byron
Email address:      byron.hammond@westnet.com.au
PostgreSQL version: 8.0.3
Operating system:   Windows XP
Description:        Function parameter names clash with table column names
Details:

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Error Details from PgAdminIII
-----------------------------
ERROR:  syntax error at or near "$1" at character 28
QUERY:  INSERT INTO test_table_0 ( $1 ,  $2 ,  $3 ) VALUES ( $4 ,  $5 ,  $6
)
CONTEXT:  PL/pgSQL function "test_function_0" line 2 at SQL statement

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Problem Code
------------
CREATE TABLE test_table_0 (
    a    varchar(255),
    b    varchar(255),
    c    varchar(255)
);

CREATE OR REPLACE FUNCTION test_function_0(a varchar, b varchar, c varchar)
RETURNS INTEGER AS $$
BEGIN
    INSERT INTO test_table_0 (a, b, c) VALUES (a, b, c);
    RETURN 1;
END
$$ LANGUAGE 'plpgsql';

SELECT test_function_0('a', 'b', 'c');

DROP FUNCTION test_function_0(varchar, varchar, varchar);
DROP TABLE test_table_0;

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Additional Comments
-------------------
It appears in this case that the parameter names of the
function cannot be the same as the column names used
by the INSERT statement -- clashes.