Hello,
My code:
> import std.string : join;
> 
> enum Key : string
> {
>     First = "qwerty",
>     Last = "zaqy"
> }
> 
> struct Qaz
> {
>     enum text(alias Values) = Values.map!(value => "bool has" ~ value ~ " = false;").join();
> }
> 
> //enum text(alias Values) = Values.map!(value => "bool has" ~ value ~ " = false;").join();
> 
> void main()
> {
>     pragma(msg, Qaz.text!([Key.First, Key.Last]));
> }

During compilation I get:
> /dlang/dmd/linux/bin64/../../src/phobos/std/algorithm/iteration.d(475): Error: this.__lambda2 has no value
> onlineapp.d(33): Error: template instance `onlineapp.Qaz.text!(["qwerty", "zaqy"])` error instantiating
> onlineapp.d(33):        while evaluating pragma(msg, (Qaz).text!(["qwerty", "zaqy"]))

If I uncomment that line and use
> pragma(msg, text!([Key.First, Key.Last]));
then compilation is passed.
What happens?