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It's not being used and uses unsound set_var and remove_var functions. This is an internal function that isn't exported (even with
process_internals
feature), so this shouldn't break anything.Also see #92365. Note that this isn't the only use of those methods in standard library, so that particular pull request will need more changes than just this to work (in particular,
test_capture_env_at_spawn
is usingset_var
andremove_var
).