public static AttributeDict parseTypedArgList(ActionAST action, String s, Grammar g) {
		return parse(action, s, ',', g);
	}
Given an arg or retval scope definition list like
<p>
<code>
Map&lt;String, String&gt;, int[] j3, char *foo32[3]
</code>
<p>
or
<p>
<code>
int i=3, j=a[34]+20
</code>
<p>
convert to an attribute scope.
tool/src/org/antlr/v4/parse/ScopeParser.java