Simple trampoline code

[BCS]

Hello Ellery,

> BCS wrote:
> 
>> Hello Ellery,
>> 
>>> bearophile wrote:
>>> 
>>>> I'm trying to convert to D2 the following (quite simplified up)
>>>> Python code, that implements a trampoline to run tail-call
>>>> functions with no stack overflow:
>>>> 
>> [...]
>> 
>>> How DO you define the signature of a function that returns itself?
>>> 
>> Last I checked, you can't. Make it return a struct that has itself.
>> 
> Thanks for reading my code
> 

I never bothered understanding what the OP's code does but to answered the 
question you asked: this is the closest I have seen to a function that can 
return (a pointer to) itself:


struct S { S function(int) fn; }

S foo(int i) { return S(&foo); }