ModelProperty property = resolver.get(source.getName());
assert property != null : source;
grouping.add(AstBuilder.toName(property));
}
return new AstSummarize(
null,
new AstModelReference(null, AstBuilder.toName(sourceModel)),
new AstModelFolding(null, foldings),
grouping.isEmpty() ? null : new AstGrouping(null, grouping));
}