The integrate_1d
function got merged into the Stan language today, so you might as well just install the development versions of stuff with
source("https://raw.githubusercontent.com/stan-dev/rstan/develop/StanHeaders/install-github.R", echo = TRUE)
remotes::install_github("stan-dev/rstan", ref = "develop", subdir = "rstan/rstan")
and then do like
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