Bug 20929 – std.experimental.allocator.expandArray's range-based overload fails to instantiate for char and wchar arrays.

If you call `expandArray` on a `char[]` or `wchar[]`, and provide a range from which to expand the array with, it will fail to instantiate. Such as with this test-case: ---- unittest { import std.experimental.allocator : expandArray, makeArray, theAllocator; import std.utf : byCodeUnit; char[] array = theAllocator.makeArray!char(0); theAllocator.expandArray(array, "foo".byCodeUnit()); assert(array == "foo"); } ---- Which fails to compile with an error message like: ---- std\experimental\allocator\package.d(2228): Error: front(toFill) is not an lvalue and cannot be modified .\expand_array_bug.d(10): Error: template instance std.experimental.allocator.expandArray!(char, RCIAllocator, ByCodeUnitImpl) error instantiating ---- I've got a PR ready to fix this, which I'll submit after this bug report.

@Just-Harry created dlang/phobos pull request #7530 "Fix issue 20929 - std.experimental.allocator.expandArray's range-based overload fails to instantiate for char and wchar arrays." fixing this issue: - Fix issue 20929 std.experimental.allocator.expandArray's range-based overload fails to instantiate for char and wchar arrays. https://github.com/dlang/phobos/pull/7530

dlang/phobos pull request #7530 "Fix issue 20929 - std.experimental.allocator.expandArray's range-based overload fails to instantiate for char and wchar arrays." was merged into master: - 86e2d75187f83495cd92b2699f93d8f4ba6e7137 by Harry Gillanders: Fix issue 20929 std.experimental.allocator.expandArray's range-based overload fails to instantiate for char and wchar arrays. https://github.com/dlang/phobos/pull/7530