continue
				}
				if err != nil {
					b.Fatalf("import %s (%s-%s): %v", name, context.GOOS, context.GOARCH, err)
				}
				w.export(pkg)
			}
			w.Features()
		}
	}
}

var warmupCache = sync.OnceFunc(func() {
	// Warm up the import cache in parallel.
	var wg sync.WaitGroup
	for _, context := range contexts {
		context := context
		wg.Add(1)
		go func() {
			defer wg.Done()