Hi,
IMHO ArrayList has a bug. Just declaring ArrayList!B bl, raises an error. But maybe I am wrong.. Nevertheless I 've filed a ticket. In case that I switch from class to struct also std.algorithm is involved.

class AListTest {
	alias ArrayList!B BList;
	BList bl;
	this() {}
	
}
class B {
	string _name;
	this(string name) {
		this._name = name;
	}
}

Error	1	Error: cannot implicitly convert expression (this._array[0u]) of type const(B) to main.B D:\dmd2\windows\bin\..\..\src\phobos\dcollections\ArrayList.d	772	
Error	2	Error: cannot implicitly convert expression (this._array[__dollar - 1u]) of type const(B) to main.B D:\dmd2\windows\bin\..\..\src\phobos\dcollections\ArrayList.d	780