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Integration tooling for annotation processors.

A contract to be implemented by other annotation processors which - against the design philosophy of JSR 269 - alter the types under compilation.

This contract will be queried by MapStruct when examining types referenced by mappers to be generated, most notably the source and target types of mapping methods. If at least one AST-modifying processor announces further changes to such type, the generation of the affected mapper(s) will be deferred to a future round in the annnotation processing cycle.

Implementations are discovered via the service loader, i.e. a JAR providing an AST-modifying processor needs to declare its implementation in a file {@code META-INF/services/org.mapstruct.ap.spi.AstModifyingAnnotationProcessor}.