Is it possible to use MLIR dialects?

def main():
    let d = __mlir_attr.`true`
    __mlir_op.`vector.print`[_type=__mlir_type.index](d)

def main():
    let d = __mlir_attr.`true`
    __mlir_op.`vector.print`[_type=__mlir_type.index](d)

$mojo guray.mojo
asd.mojo:22:54: error: use of unregistered MLIR operation 'vector.print'
    __mlir_op.`vector.print`[_type=__mlir_type.index](d)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
mojo: error: failed to parse the provided Mojo

$mojo guray.mojo
asd.mojo:22:54: error: use of unregistered MLIR operation 'vector.print'
    __mlir_op.`vector.print`[_type=__mlir_type.index](d)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
mojo: error: failed to parse the provided Mojo