NoDictionaries   Text notes for  
... cum semel occideris et de te, splendida,...

fut. perf., so also "fecerit": English idiom prefers the present tense, "when you die" or the perfect, "when you have died," rather than the fut. perf., "when you will have died," which pedants think is more precise, since it indicates completed future action or a completed future state (here, death).