The following code: import std.array; class A {} void main() { A[] arr; arr.insertInPlace(0,new A); } fails to compile on dmd 2.054, with the following error: /usr/include/d/phobos/std/array.d(753): Error: template std.conv.emplace(T) if (!is(T == class)) does not match any function template declaration /usr/include/d/phobos/std/array.d(753): Error: template std.conv.emplace(T) if (!is(T == class)) cannot deduce template function from argument types !(A)(A*,A) /usr/include/d/phobosstd/array.d(753): Error: template instance errors instantiating template It worked for dmd 2.053.
Fixed: https://github.com/D-Programming-Language/phobos/commit/65a0c2158b1d2ea8e9d3094746739da636266089