d17e0cfc5d
Fix running bootstrap tests with a local Rust toolchain as the stage0 When configuring a local Rust toolchain as the stage0 (with `build.rustc` and `build.cargo` in `config.toml`) we noticed there were test failures (both on the Python and the Rust side) due to bootstrap not being able to find rustc and Cargo. This was due to those two `config.toml` settings not being propagated in the tests. This PR fixes the issue by ensuring rustc and cargo are always configured in tests, using the parent bootstrap's `initial_rustc` and `initial_cargo`. try-job: x86_64-msvc Fixes https://github.com/rust-lang/rust/issues/105766
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