...front() returns a Tuple. We have an esoteric feature where a tuple expands automatically in...

...main() {
    auto m = iota(20).map!(i => tuple(i, format!"value_%s"(i))).assocArray;

    foreach...

...tuple("object", "core")
tuple()
-----

Since      2.094.2: Success with output:
-----
tuple("object", "core")
tuple...

...read the important parts right into a tuple.

Should it be unstructured data, then there...

...prints: tuple(fun)
pragma(msg, __traits(getOverloads, Derived1, "fun"));

class Derived2 : Base {}

// prints tuple(fun...

...successfully:

---
    // OK - use foo.tuple directly
    AliasSeq!(int) t = foo.tuple;
---


---
    // OK - attach the `this...

...foo.tuple(__tuple_field_0)` of type `(int)` to `int`
---

In other words, the tuple...

...by default.

It also has built-in: tuple types, sumtypes with implicit conversion, named parameters...

...accumulator value, the callback could return a tuple of the next value and a `bool...

...That's easier than doing some weird tuple thing.

But validating that the correct message...