https://issues.dlang.org/show_bug.cgi?id=17331
--- Comment #2 from Tomáš Chaloupka <[email protected]> --- My guess is that problem is here: https://github.com/dlang/phobos/blob/master/std/array.d#L2884 As this constructor is called when appender is used with null arr parameter. So I guess that in CTFE _data is set to the same struct pointer? --
