get size of function

[maarten van damme]

substracting the pointers to two sequential functions didn't work out. the
following snippet:
//
auto first=function void(){
asm{
naked;
nop;
}
};
auto next=function void(){
asm{
naked;
nop;
}
};
writeln(cast(int)&next-cast(int)&first,"/",cast(int)&next,"/",&next,"/",cast(int)&first,"/",&first);
//
outputs
4/1244672/12FE00/1244668/12FDFC
so the conversions from hex to int work correctly and I still get a size of
4 while it shouldve been a size of 1.
Are there other options?
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