Nothing
library(makeit)
make("first_target.R", NULL, "output/first_target.dat")
make("global_object.R", NULL, "output/global_object.dat")
make("second_target.R",
prereq=c("output/first_target.dat", "output/global_object.dat",
"inner_function.R", "outer_function.R"),
target="output/second_target.dat")
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