pub fn install_compilation_cache() -> Result<Option<PathBuf>, CacheError>Expand description
Installs the cache at default_cache_dir, or the directory
COMPILATION_CACHE_ENV names, unless that variable turns caching off.
Returns Ok(None) only when the variable disables caching.
A directory that cannot be created is reported through tracing logs and then
ignored, because denoising works without a cache. A caller that wants a
creation failure reported should use install_compilation_cache_at.