}
		})
	}
}

func errorPath(err error) string {
	var perr *PathError
	if !errors.As(err, &perr) {
		return ""
	}
	return perr.Path
}

func TestReadDirPath(t *testing.T) {
	fsys := os.DirFS(t.TempDir())
	_, err1 := ReadDir(fsys, "non-existent")
	_, err2 := ReadDir(struct{ FS }{fsys}, "non-existent")
	if s1, s2 := errorPath(err1), errorPath(err2); s1 != s2 {

	}
}

func TestReadFilePath(t *testing.T) {
	fsys := os.DirFS(t.TempDir())
	_, err1 := ReadFile(fsys, "non-existent")
	_, err2 := ReadFile(struct{ FS }{fsys}, "non-existent")
	if s1, s2 := errorPath(err1), errorPath(err2); s1 != s2 {
		t.Fatalf("s1: %s != s2: %s", s1, s2)
	}

		for _, pattern := range e.Patterns {
			files, ok := base.Flag.Cfg.Embed.Patterns[pattern]
			if !ok {
				base.ErrorfAt(e.Pos, 0, "invalid go:embed: build system did not map pattern: %s", pattern)
			}
			for _, file := range files {
				if base.Flag.Cfg.Embed.Files[file] == "" {
					base.ErrorfAt(e.Pos, 0, "invalid go:embed: build system did not map file: %s", file)
					continue
				}
				if !have[file] {

			funcs[fn] = nowritebarrierrecCall{}
			q.PushRight(fn.Nname)
		}
		// Check go:nowritebarrier functions.
		if fn.Pragma&ir.Nowritebarrier != 0 && fn.WBPos.IsKnown() {
			base.ErrorfAt(fn.WBPos, 0, "write barrier prohibited")
		}
	}

	// Perform a BFS of the call graph from all
	// go:nowritebarrierrec functions.
	enqueue := func(src, target *ir.Func, pos src.XPos) {