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palloc() includes an assertion checking that an alloc() implementation never returns NULL for all MemoryContextMethods. This commit adds a similar assertion in palloc0(). In palloc_extend(), a different assertion is added, checking that MCXT_ALLOC_NO_OOM is set when an alloc() routine returns NULL. These additions can be useful to catch errors when implementing a new set of MemoryContextMethods routines. Author: Andreas Karlsson <andreas@proxel.se> Discussion: https://postgr.es/m/507e8eba-2035-4a12-a777-98199a66beb8@proxel.se