proc_macro::tracked - Rust
Description: Functionality for adding environment state to the build dependency info.

## Module tracked

Source
🔬This is a nightly-only experimental API. (`proc_macro_tracked_path` #99515)
Expand description

Functionality for adding environment state to the build dependency info.

## Functions§

env_varExperimental
  Retrieve an environment variable and add it to build dependency info. The build system executing the compiler will know that the variable was accessed during compilation, and will be able to rerun the build when the value of that variable changes. Besides the dependency tracking this function should be equivalent to `env::var` from the standard library, except that the argument must be UTF-8.
pathExperimental
  Track a file or directory explicitly.