Quoting @sevagh:

Just to confirm that I expected the with_env(&vec[("MY_ENV_VAR", "MY_VAL")] to Just Work(TM) and it didn't - I had to use Environment::inherit().insert("MY_ENV_VAR", "MY_VAL").

Previously, I used to use https://doc.rust-lang.org/1.1.0/std/process/struct.Command.html#method.env - where:

let mut cmd = std::process::Command();
cmd.env("MY_ENV_VAR", "MY_VAL");

The usage there is just to append to the inherited environment variables, not to totally clear them.

I find the fact that with_env erases all the inherited env vars to be jarring. Any opinions?