`f` should be writable? (#572)
`f` should be writable? (#572)


hoheinzollern/FStar,YaccConstructor/FStar,A-Manning/FStar,FStarLang/FStar,YaccConstructor/FStar,YaccConstructor/FStar,FStarLang/FStar,MallabaevAzamat/FStar,hoheinzollern/FStar,hoheinzollern/FStar,A-Manning/FStar,YaccConstructor/FStar,MallabaevAzamat/FStar,MallabaevAzamat/FStar,MallabaevAzamat/FStar,FStarLang/FStar,A-Manning/FStar,hoheinzollern/FStar