{
  "schema": "ailang/v0",
  "name": "data_simple",
  "imports": [],
  "defs": [
    {
      "kind": "type",
      "name": "Box",
      "vars": ["a"],
      "doc": "A unary box around a polymorphic value.",
      "ctors": [
        {
          "name": "MkBox",
          "fields": [ { "k": "var", "name": "a" } ]
        }
      ]
    },
    {
      "kind": "fn",
      "name": "wrap_one",
      "doc": "Construct a Box Int via MkBox. The body uses (reuse-as src body) — a hint that the freshly-allocated Box should reuse the source's memory slot under --alloc=rc. Exercises TermCtor, ReuseAs, and Type::Var inside a ctor field position.",
      "type": {
        "k": "fn",
        "params": [
          { "k": "con", "name": "Box", "args": [ { "k": "con", "name": "Int" } ] }
        ],
        "param_modes": ["own"],
        "ret": { "k": "con", "name": "Box", "args": [ { "k": "con", "name": "Int" } ] },
        "ret_mode": "own",
        "effects": []
      },
      "params": ["src"],
      "body": {
        "t": "reuse-as",
        "source": { "t": "var", "name": "src" },
        "body": {
          "t": "ctor",
          "type": "Box",
          "ctor": "MkBox",
          "args": [ { "t": "lit", "lit": { "kind": "int", "value": 1 } } ]
        }
      }
    }
  ]
}