• Paolo Invernizzi (20/20) Nov 21 2016 I'm not sure if it's the same as #15064 bug:
• Stefan Koch (4/24) Nov 21 2016 Yes looks like it.

Paolo Invernizzi <paolo.invernizzi no.address> writes:

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

Stefan Koch <uplink.coder googlemail.com> writes:

On Monday, 21 November 2016 at 13:22:57 UTC, Paolo Invernizzi 
wrote:


 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

Yes looks like it.
Adding a special case in phobos should solve the problem.