gistfile1.nim

proc scanf(formatstr: cstring) {.importc: "scanf", varargs.}

var tst: int

scanf("%ld", addr(tst))
write(stdout, tst)

#error: conflicting types for 'scanf'
# N_NIMCALL(void, scanf)(NCSTRING formatstr, ...);
#                 ^
#note: in definition of macro 'N_NIMCALL'
#  #  define N_NIMCALL(rettype, name) rettype __fastcall name