JAVA-4966 : Fix Macro for sealed trait #1122
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https://jira.mongodb.org/browse/JAVA-4966
If the sealed trait and the Macro are not defined is the same module, we have the following error
No known subclasses of the sealed traitAdd a
val _to make sure thatisCaseClassreturns the correct value. This "hack" is described in scala/bug#7755It's complicated to test that, because it requires having multi modules. But this change solved the issue in my project.