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Showing content from https://scala-lang.org/api/3.x/scala/annotation/constructorOnly.html below:

constructorOnly

scala.annotation.constructorOnly

An annotation that goes on parameters of classes or traits. It asserts that the parameter is used only for initialization and is not kept in the class as a field. Violations of this assertion are flagged as compile errors. The annotation is particularly useful for implicit parameters since for these a textual scan is not sufficient to know where they are used. Note: the annotation is copied from constructor parameters to corresponding class fields. But it is checked that the field is eliminated before code is generated.

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constructorOnly.scala
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