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Avoid unsafe `std::env::set_var()` by allowing tests to inject
`std::env::var("RUSTC_BOOTSTRAP")` with a `env_var_rustc_bootstrap`
parameter.
Avoid unsafe `std::env::set_var()` by allowing tests to inject
`std::env::var("RUSTC_BOOTSTRAP")` with a `env_var_rustc_bootstrap`
parameter.