Records in records, variants, lists in records and match (Pure 027's stage 2b): a field may hold a record or a variant (flattened into paths: at.x; a variant's case a field of its own, its value at name.case) or a list of anything (list of Json, a variant holding itself through a list); variant V { case, case(type) } and V.case(value) where items are made; match item { case(name) => ... _ => ... } over an item of a variant or a variant in a field (the binding a field, a list read through a register, or fields under it; missing cases refused); x.items.append(...), xs.last.items.append, xs[i].items.append; for, folds, count, first, last and [i] over a list in a field; xs[i] an item of an unkeyed list; number(t) of a text; examples/json_tree.aup; 16 diagnostics, an accepted program, a nested values test

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