var pcflags []string
		var pkgs []string
		for _, pcarg := range pcargs {
			if pcarg == "--" {
				// We're going to add our own "--" argument.
			} else if strings.HasPrefix(pcarg, "--") {
				pcflags = append(pcflags, pcarg)
			} else {
				pkgs = append(pkgs, pcarg)
			}
		}
		for _, pkg := range pkgs {
			if !load.SafeArg(pkg) {