in.nim

import options


type
  Thingy = object
    name: string
    age: int


proc maybeMake(should: bool, name: sink string, age: int): Option[Thingy] =
  if should:
    result = some(Thingy(name: name, age: age))


import os

let should = paramCount() >= 1
let maybeMade = maybeMake(should, "Woah", 23)
if maybeMade.isSome:
  echo("made: ", maybeMade.get())
else:
  echo("didn't make anything!")

out.c

/* These are excerpts...*/

static N_INLINE(void, some__O9bbcKdkor9cIJlk9czMJJMIQoptions)(tyObject_Thingy__Gz2LnULflieca9c3QEsF4og val, tyObject_Option__BQzPjiARVLTXHzzQLjuaSw* Result) {
	unsureAsgnRef((void**)&(*Result).val.name, NIM_NIL);
	(*Result).val.age = 0;
	(*Result).has = 0;
	(*Result).has = NIM_TRUE;
	unsureAsgnRef((void**) (&(*Result).val.name), copyString(val.name));
	(*Result).val.age = val.age;
}

N_LIB_PRIVATE N_NIMCALL(void, maybeMake__iCMtBODpIX49bGSCfnP6d4A)(NIM_BOOL should, NimStringDesc* name, NI age, tyObject_Option__BQzPjiARVLTXHzzQLjuaSw* Result) {
	unsureAsgnRef((void**)&(*Result).val.name, NIM_NIL);
	(*Result).val.age = 0;
	(*Result).has = 0;
	{
		tyObject_Thingy__Gz2LnULflieca9c3QEsF4og T5_;
		if (!should) goto LA3_;
		nimZeroMem((void*)(&T5_), sizeof(tyObject_Thingy__Gz2LnULflieca9c3QEsF4og));
		nimZeroMem((void*)(&T5_), sizeof(tyObject_Thingy__Gz2LnULflieca9c3QEsF4og));
		T5_.name = copyString(name);
		T5_.age = age;
		some__O9bbcKdkor9cIJlk9czMJJMIQoptions(T5_, Result);
	}
	LA3_: ;
}