[tests] Make sure generic types are explicit in nested test for dot shorthands.

We're missing some types here to make the tests work properly.

Bug: #57038
Change-Id: I207bbf15da4fad5da33f86c6efec10fcb6b4238c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/416821
Reviewed-by: Erik Ernst <[email protected]>
Commit-Queue: Kallen Tu <[email protected]>

Author: kallentu

tests/language/dot_shorthands/multiple/nested_test.dart

@@ -9,17 +9,17 @@
 import '../dot_shorthand_helper.dart';
 
 void main() {
-  StaticMember<StaticMember> memberMember = .memberType(
+  StaticMember<StaticMember<StaticMember>> memberMember = .memberType(
     .memberType(.member()),
   );
 
-  StaticMemberExt<StaticMemberExt> memberMemberExt = .memberType(
+  StaticMemberExt<StaticMemberExt<StaticMemberExt>> memberMemberExt = .memberType(
     .memberType(.member()),
   );
 
-  StaticMember<StaticMember> memberCtor = .memberType(.new(.member()));
+  StaticMember<StaticMember<StaticMember>> memberCtor = .memberType(.new(.member()));
 
-  StaticMemberExt<StaticMemberExt> memberCtorExt = .memberType(
+  StaticMemberExt<StaticMemberExt<StaticMemberExt>> memberCtorExt = .memberType(
     .new(.member()),
   );