Азгалор
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It turns out that ATTACKER and DEFENDER are reserved words, just like CREATURE_VAMPIRE.
ATTACKER = 0
DEFENDER = 1
function IsAttacker(unit) return GetUnitSide(unit) == ATTACKER end
function IsDefender(unit) return GetUnitSide(unit) == DEFENDER end
function GetAttackerHero() local temp = GetHero(ATTACKER) return temp end
function GetDefenderHero() local temp = GetHero(DEFENDER) return temp end
function GetAttackerCreatures() local temp = GetCreatures(ATTACKER) return temp end
function GetDefenderCreatures() local temp = GetCreatures(DEFENDER) return temp end
function GetAttackerWarMachines() local temp = GetWarMachines(ATTACKER) return temp end
function GetDefenderWarMachines() local temp = GetWarMachines(DEFENDER) return temp end
function GetAttackerBuildings() local temp = GetBuildings(ATTACKER) return temp end
function GetDefenderBuildings() local temp = GetBuildings(DEFENDER) return temp end
function GetAttackerSpellSpawns() local temp = GetSpellSpawns(ATTACKER) return temp end
function GetDefenderSpellSpawns() local temp = GetSpellSpawns(DEFENDER) return temp end
and so on.So yes, you shouldn't modify these two constants, otherwise the entire combat script will break.