@ ProgramNode (location: (0...44))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...44))
    └── body: (length: 4)
        ├── @ CallNode (location: (0...9))
        │   ├── receiver:
        │   │   @ CallNode (location: (0...3))
        │   │   ├── receiver: ∅
        │   │   ├── call_operator_loc: ∅
        │   │   ├── message_loc: (0...3) = "foo"
        │   │   ├── opening_loc: ∅
        │   │   ├── arguments: ∅
        │   │   ├── closing_loc: ∅
        │   │   ├── block: ∅
        │   │   ├── flags: variable_call
        │   │   └── name: "foo"
        │   ├── call_operator_loc: (3...4) = "."
        │   ├── message_loc: (4...5) = "A"
        │   ├── opening_loc: ∅
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (8...9))
        │   │   └── arguments: (length: 1)
        │   │       └── @ IntegerNode (location: (8...9))
        │   │           └── flags: decimal
        │   ├── closing_loc: ∅
        │   ├── block: ∅
        │   ├── flags: ∅
        │   └── name: "A="
        ├── @ CallNode (location: (11...20))
        │   ├── receiver:
        │   │   @ CallNode (location: (11...14))
        │   │   ├── receiver: ∅
        │   │   ├── call_operator_loc: ∅
        │   │   ├── message_loc: (11...14) = "foo"
        │   │   ├── opening_loc: ∅
        │   │   ├── arguments: ∅
        │   │   ├── closing_loc: ∅
        │   │   ├── block: ∅
        │   │   ├── flags: variable_call
        │   │   └── name: "foo"
        │   ├── call_operator_loc: (14...15) = "."
        │   ├── message_loc: (15...16) = "a"
        │   ├── opening_loc: ∅
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (19...20))
        │   │   └── arguments: (length: 1)
        │   │       └── @ IntegerNode (location: (19...20))
        │   │           └── flags: decimal
        │   ├── closing_loc: ∅
        │   ├── block: ∅
        │   ├── flags: ∅
        │   └── name: "a="
        ├── @ ConstantPathWriteNode (location: (22...32))
        │   ├── target:
        │   │   @ ConstantPathNode (location: (22...28))
        │   │   ├── parent:
        │   │   │   @ CallNode (location: (22...25))
        │   │   │   ├── receiver: ∅
        │   │   │   ├── call_operator_loc: ∅
        │   │   │   ├── message_loc: (22...25) = "foo"
        │   │   │   ├── opening_loc: ∅
        │   │   │   ├── arguments: ∅
        │   │   │   ├── closing_loc: ∅
        │   │   │   ├── block: ∅
        │   │   │   ├── flags: variable_call
        │   │   │   └── name: "foo"
        │   │   ├── child:
        │   │   │   @ ConstantReadNode (location: (27...28))
        │   │   │   └── name: :A
        │   │   └── delimiter_loc: (25...27) = "::"
        │   ├── operator_loc: (29...30) = "="
        │   └── value:
        │       @ IntegerNode (location: (31...32))
        │       └── flags: decimal
        └── @ CallNode (location: (34...44))
            ├── receiver:
            │   @ CallNode (location: (34...37))
            │   ├── receiver: ∅
            │   ├── call_operator_loc: ∅
            │   ├── message_loc: (34...37) = "foo"
            │   ├── opening_loc: ∅
            │   ├── arguments: ∅
            │   ├── closing_loc: ∅
            │   ├── block: ∅
            │   ├── flags: variable_call
            │   └── name: "foo"
            ├── call_operator_loc: (37...39) = "::"
            ├── message_loc: (39...40) = "a"
            ├── opening_loc: ∅
            ├── arguments:
            │   @ ArgumentsNode (location: (43...44))
            │   └── arguments: (length: 1)
            │       └── @ IntegerNode (location: (43...44))
            │           └── flags: decimal
            ├── closing_loc: ∅
            ├── block: ∅
            ├── flags: ∅
            └── name: "a="
