Explain deprecated member use of "elements2"

moor_generator/lib/src/parser/table_parser.dart

@@ -88,6 +88,9 @@ class TableParser extends ParserBase {
     final parsedPrimaryKey = <SpecifiedColumn>{};
 
     if (expression is SetOrMapLiteral) {
+      // todo replace with just "elements" when dropping support for analyzer
+      // 0.35.0
+      // ignore: deprecated_member_use
       for (var entry in expression.elements2) {
         if (entry is Identifier) {
           final column = columns