# NOT RUN {
mod_a <- mod::ule(number <- 1)
mod_b <- mod::ule(number <- 2)
mod_c <- mod::ule({
mod:::refer(mod_a, mod_b, prefix = .)
# It is suggested to omit mod::: when using
number <- mod_a.number + mod_b.number
})
mod_c$number
# }
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