Bug 5265 – std.array.back does not work correctly for wchar-based arrays

In std.array, back() is the same for both char[] based and wchar[] based arrays, but wchar[] based arrays are encoded differently than char[] based ones. It appears the back() function works in most cases, but fails on a few. Here is an example (thank you to Stephan): import std.array; import std.conv; void main() { dchar c = cast(dchar) 0x10000; auto ws = to!wstring(c); assert(ws.length == 2); // decoded as surrogate pair assert(ws.back == c); // fails with decoding error } This should be added as a unit test, and back(wstring) should get its own implementation.

Works in 2.061. Was a test-case added though? If not it should be put in.

It was fixed around June of 2011 by Jonathan Davis. He simply changed the implementation from using an incorrect local algorithm to using std.utf.