}

    public void mutate(String method, Runnable action) {
        if (!task.getState().isConfigurable()) {
            throw new IllegalStateException(format(method));
        }
        action.run();
    }

    public <T> T mutate(String method, Callable<T> action) {
        if (!task.getState().isConfigurable()) {
            throw new IllegalStateException(format(method));
        }

            if (isConfigurable()) {
                Object value = cachedInvoker.get();
                ((HasConfigurableValueInternal) value).implicitFinalizeValue();
            }
        }

        private boolean isProvider() {
            return Provider.class.isAssignableFrom(declaredType);
        }

        private boolean isConfigurable() {

		}
		*ptr = v
	default:
		panic(fmt.Sprintf("unsupported config field type %v", f.field.Type))
	}
	return nil
}

// isConfigurable returns true if name is either the name of a config field, or
// a valid value for a multi-choice config field.
func isConfigurable(name string) bool {
	_, ok := configFieldMap[name]
	return ok
}

// isBoolConfig returns true if name is either name of a boolean config field,