getwd()
in_dir(tempdir(), getwd())
getwd()
Sys.getenv("HADLEY")
with_envvar(c("HADLEY" = 2), Sys.getenv("HADLEY"))
Sys.getenv("HADLEY")
with_envvar(c("A" = 1),
with_envvar(c("A" = 2), action = "suffix", Sys.getenv("A"))
)
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