@ ProgramNode (location: (0...20))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...20))
    └── body: (length: 1)
        └── @ CallNode (location: (0...20))
            ├── receiver: ∅
            ├── call_operator_loc: ∅
            ├── message_loc: (0...2) = "bl"
            ├── opening_loc: ∅
            ├── arguments: ∅
            ├── closing_loc: ∅
            ├── block:
            │   @ BlockNode (location: (3...20))
            │   ├── locals: [:kw]
            │   ├── parameters:
            │   │   @ BlockParametersNode (location: (5...15))
            │   │   ├── parameters:
            │   │   │   @ ParametersNode (location: (6...14))
            │   │   │   ├── requireds: (length: 0)
            │   │   │   ├── optionals: (length: 0)
            │   │   │   ├── rest: ∅
            │   │   │   ├── posts: (length: 0)
            │   │   │   ├── keywords: (length: 1)
            │   │   │   │   └── @ KeywordParameterNode (location: (6...14))
            │   │   │   │       ├── name: :kw
            │   │   │   │       ├── name_loc: (6...9) = "kw:"
            │   │   │   │       └── value:
            │   │   │   │           @ SymbolNode (location: (10...14))
            │   │   │   │           ├── opening_loc: (10...11) = ":"
            │   │   │   │           ├── value_loc: (11...14) = "val"
            │   │   │   │           ├── closing_loc: ∅
            │   │   │   │           └── unescaped: "val"
            │   │   │   ├── keyword_rest: ∅
            │   │   │   └── block: ∅
            │   │   ├── locals: (length: 0)
            │   │   ├── opening_loc: (5...6) = "|"
            │   │   └── closing_loc: (14...15) = "|"
            │   ├── body:
            │   │   @ StatementsNode (location: (16...18))
            │   │   └── body: (length: 1)
            │   │       └── @ LocalVariableReadNode (location: (16...18))
            │   │           ├── name: :kw
            │   │           └── depth: 0
            │   ├── opening_loc: (3...4) = "{"
            │   └── closing_loc: (19...20) = "}"
            ├── flags: ∅
            └── name: "bl"
