Function with_chain_resolution_cache

src/completion/resolver.rs:93–102

Activate the thread-local chain resolution cache. While the returned guard is alive, `resolve_target_classes` caches its results by subject text so that shared chain prefixes are resolved only once. Nested activations are no-ops — the outermost guard owns the cache.

()

///
/// Nested activations are no-ops — the outermost guard owns the cache.
pub(crate) fn with_chain_resolution_cache() -> ChainCacheGuard {
    let already_active = CHAIN_CACHE.with(|cell| cell.borrow().is_some());
    if already_active {
        return ChainCacheGuard { owns: false };
    }
    CHAIN_CACHE.with(|cell| {
        *cell.borrow_mut() = Some(HashMap::new());
    });
    ChainCacheGuard { owns: true }
}

/// Type alias for the optional function-loader closure passed through
/// the resolution chain.  Reduces clippy `type_complexity` warnings.