=== after regify ===
[
    RegFn {
        name: "test",
        arg_count: 0,
        var_count: 4,
        value_names: [
            file_atom[2],
            atom("<class_fields_init>"),
            file_atom[2],
            file_atom[3],
        ],
        captures: [],
        cpool: [
            FnById(
                2,
            ),
            FnById(
                3,
            ),
            FnById(
                4,
            ),
        ],
        code: [
            [] = SetLocUninitialized Loc(3) [],
            [] = SetLocUninitialized Loc(2) [],
            [] = SetLocUninitialized Loc(0) [],
            [4] = Undefined None [],
            [] = SetLocUninitialized Loc(1) [],

            // This is the pattern to be replaced by prototype form
            [5] = PushConst8 Const(1) [],
            [6, 7] = DefineClass AtomU8 { atom: file_atom[2], arg: 0 } [5, 4],
            [8] = Fclosure8 Const(0) [],
            [9] = DefineMethod AtomU8 { atom: file_atom[5], arg: 0 } [8, 7],
            [10] = Fclosure8 Const(2) [],
            [11, 12] = SetHomeObject None [10, 9],
            [] = PutLoc1 None [12],
            [] = Drop None [11],

            [13] = SetLoc0 None [6],
            [] = CloseLoc Loc(1) [],
            [] = PutLoc2 None [13],
            [14] = GetLocCheck Loc(2) [],
            [15, 16] = Dup None [14],
            [17] = CallConstructor Npop(0) [16, 15],
            [] = PutLoc3 None [17],
            [] = ReturnUndef None [],
        ],
        next_val: 18,
    },
    RegFn {
        name: "<null>", // method, unchanged
        arg_count: 0,
        var_count: 0,
        value_names: [],
        captures: [],
        cpool: [],
        code: [
            [] = ReturnUndef None [],
        ],
        next_val: 0,
    },
    RegFn {
        name: "<null>", // constructor, needs to be renamed to "Counter"
        arg_count: 0,
        var_count: 1,
        value_names: [
            atom("this"),
        ],
        captures: [
            Capture {
                name: "<class_fields_init>",
                atom: atom("<class_fields_init>"),
                from: ParentLocal(
                    1,
                ),
            },
        ],
        cpool: [],
        code: [
            [1] = PushThis None [],
            [] = PutLoc0 None [1],
            [] = CheckCtor None [],
            [2] = GetVarRefCheck VarRef(0) [],
            [3, 4] = Dup None [2],
            [] = IfFalse8 Label { target: 14 } [4],
            [5] = GetLoc0 None [],
            [6, 7] = Swap None [5, 3],
            [8] = CallMethod Npop(0) [7, 6],
            [] = ReturnUndef None [],
        ],
        next_val: 9,
    },
    RegFn {
        name: "<null>", // instance fields initializer, needs thinking
        arg_count: 0,
        var_count: 2,
        value_names: [
            atom("this"),
            atom("<home_object>"),
        ],
        captures: [],
        cpool: [],
        code: [
            [2] = SpecialObject U8(4) [],
            [] = PutLoc1 None [2],
            [3] = PushThis None [],
            [] = PutLoc0 None [3],
            [] = Goto8 Label { target: 7 } [],
            [4] = GetLoc0 None [],
            [5] = Push1 None [],
            [6] = DefineField Atom(file_atom[4]) [5, 4],
            [] = ReturnUndef None [],
        ],
        next_val: 7,
    },
]
[
    String(
        "../test.js",
    ),
    String(
        "test",
    ),
    String(
        "Counter",
    ),
    String(
        "c",
    ),
    String(
        "x",
    ),
    String(
        "m1",
    ),
]