Z_Malloc error

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Z_Malloc errors occur whenever any algorithm or set of data in the Doom engine (whether it be number of things, linedefs, etc.) exceeds the designated heap size for the game. A fixed amount of RAM is allocated to the zone memory system at startup and any process which causes that memory to be completely exhausted will cause the program to exit.

Nuts is an example if run on vanilla (crash at 63047+ bytes) or Chocolate Doom (crash at 262000+ bytes).