A record literal with a run-time field cannot be assigned to a class type (invalid cast) #487

A record literal with a field known only at run time cannot be assigned to a class type.

class P {
    x: number;
    items: number[];
}

function main() {
    let i = 7;
    const p: P = { x: 1, items: [i, 2] };
    print(p.items.length);
}

error: invalid cast from {x:s32, items:s32[]} to P

Expected: 2.

With every field constant ({ x: 1, items: [1, 2] }), the record is a constant tuple and the cast works (castTupleLikeVariants: constant tuple to class goes through castTupleToClass). A record with a run-time field is a ts.CreateTuple/slot value of tuple type, and the tuple-to-class branch reports "invalid cast" instead of building the instance the same way.

Same on main (77d9a6a) and with #484.

Found while testing #484 (#479).

🤖 Generated with Claude Code