How use input parameter as path to COPY in function?

[Bill Todd <pg@xxxxxxxxxx>]

I am missing something basic. How can I  use an input parameter as the 
destination path in a COPY statement in a function. The following fails 
with a syntax error at or near the parameter.

CREATE OR REPLACE FUNCTION  dvd.export_tables(IN export_path text)
RETURNS void
AS
$$
BEGIN
 copy dvd.genre to export_path
 with
 delimiter as E'\t'
 null as '';
END;
$$
 LANGUAGE 'plpgsql' VOLATILE




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