(Info-goto-node "(elisp)System Environment")
Emacs maintains its own copy of the path and environment which is not visible to OCaml. Therefore, Async.Process.create will not give the same path and environment as Ecaml.Process.create, and Ecaml.System.setenv ~var:"PATH" does not affect the behavior of Async.Process.create (or Ecaml.Process.create!).
(describe-function 'getenv) (Info-goto-node "(elisp)System Environment")
(describe-function 'setenv) (Info-goto-node "(elisp)System Environment")
val process_environment : string list Var.t(describe-variable 'process-environment) (Info-goto-node "(elisp)System Environment")
val exec_path : string list Var.t(describe-variable 'exec-path)
module Var_and_value : sig ... endval setenv_temporarily : Var_and_value.t list -> f:(unit -> 'a) -> 'a