[R] Alternate error structures in lme4?

[bamsel]

Hi R users, 

The nlme library enabled several alternate error structures useful for
longitudinal or repeated-measures data. For example, a continuous AR(1)
process:

model_2 = update(model_1, correlation = corCAR1(form = ~ time | subject))

Does anybody know if this is available in lme4?

Thank you
Ben
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