https://issues.dlang.org/show_bug.cgi?id=15908
greensunn...@gmail.com changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |greensunn...@gmail.com --- Comment #2 from greensunn...@gmail.com --- Uranuz from D.learn also hit this bug - in his/her case for structs: http://forum.dlang.org/post/noq45h$lgu$1...@digitalmars.com struct A { import std.algorithm: map; import std.array: array; import std.typecons: tuple; static immutable aaa = [ tuple("1", "one"), tuple("2", "two"), tuple("3", "three") ]; static immutable bbb = aaa.map!( a => a[0] ).array; } void main() { A a = A(); } //--------- Compilation output: /opt/compilers/dmd2/include/std/algorithm/iteration.d(455): Error: this.__lambda6 has no value > I'm pretty sure it's ctfe specific. On DMD nightly you even get a better error message saying that am error during CTFE happened :/ --