library(Romp)
x <- rnorm(100)
R <- sum(x)
c <- c_sum(x)
f77 <- f77_sum(x)
f90 <- f90_sum(x)
rcpp <- rcpp_sum(x)
stopifnot(all.equal(R, c))
stopifnot(all.equal(R, f77))
stopifnot(all.equal(R, f90))
stopifnot(all.equal(R, rcpp))
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