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Fix `compiletest` path-related issues on Windows fixes the issues mentioned [here](https://github.com/rust-lang/rust/pull/147552#issuecomment-4178431869). With these changes I'm able to run `./x test tests/debuginfo` on `x86_64-pc-windows-gnu` without any issues. As mentioned in the link though, there are 3 tests that currently fail when run on windows, but that pass on whatever CI targets actually run `tests/debuginfo`. I'm not sure if `target_run_lib_path` really needs to be prepended on all targets (it absolutely does for Windows though), but i figure it can't hurt. Also made sure the path separators are correct per-platform. The `lldb_batchmode` change prevents the tests from hanging forever. I'm not 100% sure why this hasn't been a problem so far. Maybe just due to the version of LLDB used on the test runner? I haven't done too much testing, but the situation is...weird. I opened [an issue about it in the LLVM repo](https://github.com/llvm/llvm-project/issues/190516).
This directory contains some source code for the Rust project, including:
- The bootstrapping build system
- Various submodules for tools, like cargo, tidy, etc.
For more information on how various parts of the compiler work, see the rustc dev guide.