Nothing
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)
## >> Error in coef(object) : object 'object' not found
gmodels:::estimable.mlm(lm.1, cm)
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