How can D return 0 on success and non-zero on failure if main is void? -

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in d, main function defined: 

void main(/*perhaps args not remember*/) {  }

i know sure function returns 0 on success , non-zero on failure , yet defined not returning anything. logic behind it?

function void return type not return value. there nothing illogical when consider call stack looks this:

os -> d runtime -> main

the main function invoked d runtime system, recognized main function returns nothing - , in case return success os. in case main function defined return type int, d runtime return os value returned main function.


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