void main() @safe {
    import std.algorithm: remove;
    import std.typecons: Tuple;
    alias Foo = Tuple!int;
    Foo[] data;
    data.remove!(x => x == Foo());
}


DMD 2.066alpha gives:

temp.d(6,9): Error: safe function 'D main' cannot call system function 'temp.main.remove!((x) => x == Foo(), cast(SwapStrategy)2, Tuple!int[]).remove'