@Nullable
    VariableResolver asVariableResolver() {
        if (this == NONE) {
            return null;
        }
        return new DefaultVariableResolver(this);
    }
Adapts this {link ResolvableType} to a {link VariableResolver}.
analyzer/src/main/java/nl/basjes/parse/useragent/utils/springframework/core/ResolvableType.java