ld not be <code>null</code>.</p>
<p>The <code>positionalArguments</code> is a list of the positional arguments that the
method was called with. If <code>null</code>, it is considered equivalent to the
empty list.</p>
<p>The <code>namedArguments</code> is a map from <a href="dart-core/Symbol-class.html">Symbol</a>s to the values of named
arguments that the method was called with.</p>
<p>This constructor does not handle type arguments.
To include type variables, create an <a href="dart-core/Invocation-class.h