I'm not sure if it's the same as #15064 bug:
import std.array, std.range, std.algorithm;
immutable static foo = ["a", "b", "c"];
auto bar(R)(R r)
{
string s = r[1];
return s;
}
immutable static res = foo.enumerate.map!bar().array;
std/typecons.d(526): Error: reinterpreting cast from
inout(ulong)* to inout(Tuple!(ulong, immutable(string)))* is not
supported in CTFE
bug.d(9): called from here: r._Tuple_super()
std/algorithm/iteration.d(593): called from here:
bar(this._input.front())
std/array.d(105): called from here: __r2091.front()
bug.d(15): called from here: array(map(enumerate(foo,
0LU)))
---
Paolo