R Under development (unstable) (2024-03-05 r86054 ucrt) -- "Unsuffered Consequences"
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> library(gmodels)
> 
> y <- cbind(rnorm(100), rnorm(100))
> 
> x1 <- rnorm(100)
> x2 <- rnorm(100)
> 
> cm <- t(matrix(c(0, 1,-1)))
> lm.1 <- lm(y ~ x1 + x2)
> 
> estimable(lm.1, cm)
Response Y1 :
           Estimate Std. Error  t value DF  Pr(>|t|)
(0 1 -1) -0.1756287  0.1163234 -1.50983 97 0.1343374

Response Y2 :
           Estimate Std. Error    t value DF  Pr(>|t|)
(0 1 -1) -0.0727021  0.1319147 -0.5511296 97 0.5828121

> 
> ## >> Error in coef(object) : object 'object' not found
> 
> gmodels:::estimable.mlm(lm.1, cm)
Response Y1 :
           Estimate Std. Error  t value DF  Pr(>|t|)
(0 1 -1) -0.1756287  0.1163234 -1.50983 97 0.1343374

Response Y2 :
           Estimate Std. Error    t value DF  Pr(>|t|)
(0 1 -1) -0.0727021  0.1319147 -0.5511296 97 0.5828121

> 
> proc.time()
   user  system elapsed 
   0.31    0.06    0.34