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			C functions with no arguments must be declared foo(void) instead of foo(). The tracetool argument list parser has never accepted an empty argument list. This patch adds a clear error message for this error case. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-id: 20180110202553.31889-4-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>