verify(bot)
bot[12] <- NA
# you would not use try, but here we cope with R CMD CHECK standards
plop <- try(verify(bot), silent=TRUE)
class(plop)
verify(hearts)
hearts$ldk[[4]] <- c(1, 2)
# same remark
plop2 <- try(verify(hearts), silent=TRUE)
class(plop2)
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