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This allows the compiler / linker to mark affected pages as read-only. Doing so requires casting constness away, as CreateDestReceiver() returns both constant and non-constant dest receivers. That's fine though, as any modification of the statically allocated receivers would already have been a bug (and would now be caught on some platforms). Discussion: https://postgr.es/m/20181015200754.7y7zfuzsoux2c4ya@alap3.anarazel.de