Crate piano 

Modules

build

error

naming

report

resolve

rewrite

Source rewriter: single-pass zero-shift injection of profiling infrastructure.

source_map

staging

Staging overlay: mirror a directory tree with symlinks, overlaying instrumented file copies. Preserves all path resolution (modules, include!, include_str!) by maintaining identical directory structure.

wrapper

RUSTC_WORKSPACE_WRAPPER mode: intercept rustc invocations to instrument source files and inject piano-runtime.