Unpretty

The unpretty rules expose rustc's -Zunpretty=<mode> flag as a Bazel action. Given a Rust target, they emit an alternate textual representation of it — the fully macro-expanded source, the HIR, the MIR CFG, etc. — useful for inspecting what the compiler sees after macro expansion, lowering, or optimization.

Because -Zunpretty is a nightly-only compiler flag, these rules require a nightly rust_toolchain to be registered.

Rules

• rust_unpretty — Rule form. Explicitly declare an unpretty target that emits the chosen representation for a specific crate.
• rust_unpretty_aspect — Aspect form. Attach at the command line (--aspects=@rules_rust//rust:defs.bzl%rust_unpretty_aspect --output_groups=+rust_unpretty) to emit the representation for every Rust target in the build without adding rule instances.