Matthias Krüger
92fd45b14f
bootstrap: Fix stack printing when a step cycle is detected When bootstrap detects a step dependency cycle (which represents a bootstrap bug), it is supposed to print out the contents of the step stack as part of its panic message. However, while investigating #138205 it was found that bootstrap was actually printing out several copies of `Any { .. }`, because that is the Debug implementation for `dyn Any`. This is sadly not very helpful. This PR fixes that problem by introducing a `trait AnyDebug: Any + Debug` that delegates to the underlying type's Debug implementation, while still allowing downcasting via Any. --- The fixed behaviour can be verified manually (and is tested automatically) via a new dummy command, `./x run cyclic-step`: ``` $ x run cyclic-step Building bootstrap Finished `dev` profile [unoptimized] target(s) in 0.02s thread 'main' panicked at src/bootstrap/src/core/builder/mod.rs:1521:17: Cycle in build detected when adding CyclicStep { n: 0 } CyclicStep { n: 0 } CyclicStep { n: 1 } CyclicStep { n: 2 } note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace Build completed unsuccessfully in 0:00:00 ```
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