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> library(mlmRev)
Loading required package: lme4
Loading required package: Matrix
Loading required package: lattice
> options(show.signif.stars = FALSE)
> Early$tos <- Early$age - 0.5
> (fm1 <- lmer(cog ~ tos * trt + (tos|id), Early))
Linear mixed-effects model fit by REML 
Formula: cog ~ tos * trt + (tos | id) 
   Data: Early 
  AIC  BIC logLik MLdeviance REMLdeviance
 2378 2404  -1182       2375         2364
Random effects:
 Groups   Name        Variance   Std.Dev.   Corr  
 id       (Intercept) 9.2307e+01 9.60764658       
          tos         3.9029e-08 0.00019756 0.000 
 Residual             7.8058e+01 8.83505762       
number of obs: 309, groups: id, 103

Fixed effects:
            Estimate Std. Error t value
(Intercept)  118.407      2.470   47.95
tos          -21.133      1.863  -11.35
trtY           4.219      3.291    1.28
tos:trtY       5.271      2.482    2.12

Correlation of Fixed Effects:
         (Intr) tos    trtY  
tos      -0.754              
trtY     -0.750  0.566       
tos:trtY  0.566 -0.750 -0.754
Warning message:
Estimated variance-covariance for factor 'id' is singular
 in: `LMEoptimize<-`(`*tmp*`, value = list(maxIter = 200, tolerance = 1.49011611938477e-08,  
> q("no")