min and max are predeclared identifiers in the universe block, not reserved words. https://go.dev/ref/spec#Predeclared_identifiers https://go.dev/ref/spec#Pred

min and max are predeclared identifiers in the universe block, not reserved words. https://go.dev/ref/spec#Predeclared_identifiers https://go.dev/ref/spec#Predeclared_identifiers You can continue to declare your own entities with these names.