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digitalmars.D.learn - Error: this.__lambda2 has no value

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?
Apr 01