@ ProgramNode (location: (1,0)-(1,12))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(1,12))
    └── body: (length: 1)
        └── @ IfNode (location: (1,0)-(1,12))
            ├── if_keyword_loc: (1,5)-(1,7) = "if"
            ├── predicate:
            │   @ TrueNode (location: (1,8)-(1,12))
            ├── then_keyword_loc: ∅
            ├── statements:
            │   @ StatementsNode (location: (1,0)-(1,5))
            │   └── body: (length: 1)
            │       └── @ IntegerNode (location: (1,0)-(1,5))
            │           └── flags: decimal
            ├── consequent: ∅
            └── end_keyword_loc: ∅
