R Under development (unstable) (2024-03-07 r86063 ucrt) -- "Unsuffered Consequences"
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> library(survey)
Loading required package: grid
Loading required package: Matrix
Loading required package: survival

Attaching package: 'survey'

The following object is masked from 'package:graphics':

    dotchart

> data(api)
> dclus2<-svydesign(id=~dnum+snum, weights=~pw, data=apiclus2)
> rclus2<-as.svrepdesign(dclus2)
> model<-svyglm(formula = api00 ~ ell + meals + mobility, design = rclus2)
> svycontrast(model, c(ell=1,meals=0))
         contrast     SE
contrast  -2.0592 1.6177
> a<-svycontrast(model, c(0,1,0,0))
> 
> model2<-svyglm(formula = api00 ~ ell + meals + mobility, design = rclus2,return.replicates=TRUE)
> svycontrast(model2, c(ell=1,meals=0))
         contrast     SE
contrast  -2.0592 1.6177
> a2<-svycontrast(model2, c(0,1,0,0))
> stopifnot(!is.null(a2$replicates))
> 
> proc.time()
   user  system elapsed 
   1.06    0.17    1.21