A `spread_expr` element inside a tuple literal now expands the pack into the tuple's fields: `(..xs.get)` ≈ `(xs[0].get(), …, xs[N-1].get())` (Decision 2 — a pack is stored by materializing a tuple). lowerTupleLiteral detects a pack-spread element via packSpreadRefs and splices the per-element Refs as fields (typed via getRefType); for Box(T) the materialized tuple is heterogeneous. A spread whose operand isn't a pack falls through to the existing spread_expr diagnostic (tuple-value spread not yet handled). When any element is a spread, field-count ≠ element-count, so the contextual target-tuple alignment is skipped (field types inferred from the expanded refs). examples/198-pack-tuple-materialize.sx.
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