Nothing
muststop <- function(expr, silent = TRUE) {
tryExpr <- substitute(tryCatch(expr, error=function(cond)cond))
value <- eval.parent(tryExpr)
if(inherits(value, "error")) {
if(!silent)
message("muststop reports: ", value)
invisible(value)
}
else
stop(gettextf("The expression %s should have thrown an error, but instead returned an object of class \"%s\"",
deparse(substitute(expr))[[1]], class(value)))
}
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