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e5f5464365
Improve the Rust build configuration used by sanitizer and fuzzing workflows. This change adds three pieces of support: - require a nightly Rust toolchain whenever `-Zsanitizer` is present in `RUSTFLAGS`, since Rust sanitizer support is unstable - fail early when `-Zsanitizer=memory` is requested for an unsupported Rust target instead of surfacing a later Cargo ABI mismatch - rebuild the Rust standard library with `-Zbuild-std` for MemorySanitizer so `core` and the rest of `std` use the same sanitizer ABI as the project crates