6164 – [CTFE] Local arrays in a recursive local function behave funny

This is tt.d:
import std.stdio;
string ctfe(){
 int[] ctfe2(int n){
 int[] r=[];
 if(n!=0) r~=[1]~ctfe2(n-1);
 return r;
 }
 return ctfe2(2).length == 2 ?
 "hello from runtime!" : "hello from compile time!";
}
void main(){
 pragma(msg,ctfe());
 writeln(ctfe());
}
$ dmd -run tt;
hello from compile time!
hello from runtime!
$
The ctfe'd result is generally longer than the correct one.
The example works as expected if ctfe2 is moved outside ctfe.

A workaround is to make ctfe2 a 'static function'.

https://github.com/D-Programming-Language/dmd/commit/1ebe10d6796db6acf62b456d6f908391ec4daad5
(subsequently reverted, and then recommitted).