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wait_event.h itself includes wait_event_types.h, which is a generated file, so it's nice that we can avoid compiling >10% of the tree just because that file is regenerated. To avoid breaking too many third-party modules, we now #include utils/wait_classes.h in storage/latch.h. Then, the very common case of doing WaitLatch(..., PG_WAIT_EXTENSION) continues to work by including just storage/latch.h. (I didn't try to determine how many modules would actually break if we don't do this, but this seems a convenient and low-impact measure.) Reviewed-by: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/202602181214.gcmhx2vhlxzp@alvherre.pgsql