@ ProgramNode (location: (1,0)-(17,14))
├── flags: ∅
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(17,14))
    ├── flags: ∅
    └── body: (length: 9)
        ├── @ UndefNode (location: (1,0)-(1,7))
        │   ├── flags: newline
        │   ├── names: (length: 1)
        │   │   └── @ SymbolNode (location: (1,6)-(1,7))
        │   │       ├── flags: static_literal, forced_us_ascii_encoding
        │   │       ├── opening_loc: ∅
        │   │       ├── value_loc: (1,6)-(1,7) = "a"
        │   │       ├── closing_loc: ∅
        │   │       └── unescaped: "a"
        │   └── keyword_loc: (1,0)-(1,5) = "undef"
        ├── @ UndefNode (location: (3,0)-(3,10))
        │   ├── flags: newline
        │   ├── names: (length: 2)
        │   │   ├── @ SymbolNode (location: (3,6)-(3,7))
        │   │   │   ├── flags: static_literal, forced_us_ascii_encoding
        │   │   │   ├── opening_loc: ∅
        │   │   │   ├── value_loc: (3,6)-(3,7) = "a"
        │   │   │   ├── closing_loc: ∅
        │   │   │   └── unescaped: "a"
        │   │   └── @ SymbolNode (location: (3,9)-(3,10))
        │   │       ├── flags: static_literal, forced_us_ascii_encoding
        │   │       ├── opening_loc: ∅
        │   │       ├── value_loc: (3,9)-(3,10) = "b"
        │   │       ├── closing_loc: ∅
        │   │       └── unescaped: "b"
        │   └── keyword_loc: (3,0)-(3,5) = "undef"
        ├── @ UndefNode (location: (5,0)-(5,8))
        │   ├── flags: newline
        │   ├── names: (length: 1)
        │   │   └── @ SymbolNode (location: (5,6)-(5,8))
        │   │       ├── flags: static_literal, forced_us_ascii_encoding
        │   │       ├── opening_loc: ∅
        │   │       ├── value_loc: (5,6)-(5,8) = "if"
        │   │       ├── closing_loc: ∅
        │   │       └── unescaped: "if"
        │   └── keyword_loc: (5,0)-(5,5) = "undef"
        ├── @ UndefNode (location: (7,0)-(7,9))
        │   ├── flags: newline
        │   ├── names: (length: 1)
        │   │   └── @ SymbolNode (location: (7,6)-(7,9))
        │   │       ├── flags: static_literal, forced_us_ascii_encoding
        │   │       ├── opening_loc: ∅
        │   │       ├── value_loc: (7,6)-(7,9) = "<=>"
        │   │       ├── closing_loc: ∅
        │   │       └── unescaped: "<=>"
        │   └── keyword_loc: (7,0)-(7,5) = "undef"
        ├── @ UndefNode (location: (9,0)-(9,8))
        │   ├── flags: newline
        │   ├── names: (length: 1)
        │   │   └── @ SymbolNode (location: (9,6)-(9,8))
        │   │       ├── flags: static_literal, forced_us_ascii_encoding
        │   │       ├── opening_loc: (9,6)-(9,7) = ":"
        │   │       ├── value_loc: (9,7)-(9,8) = "a"
        │   │       ├── closing_loc: ∅
        │   │       └── unescaped: "a"
        │   └── keyword_loc: (9,0)-(9,5) = "undef"
        ├── @ UndefNode (location: (11,0)-(11,16))
        │   ├── flags: newline
        │   ├── names: (length: 3)
        │   │   ├── @ SymbolNode (location: (11,6)-(11,8))
        │   │   │   ├── flags: static_literal, forced_us_ascii_encoding
        │   │   │   ├── opening_loc: (11,6)-(11,7) = ":"
        │   │   │   ├── value_loc: (11,7)-(11,8) = "a"
        │   │   │   ├── closing_loc: ∅
        │   │   │   └── unescaped: "a"
        │   │   ├── @ SymbolNode (location: (11,10)-(11,12))
        │   │   │   ├── flags: static_literal, forced_us_ascii_encoding
        │   │   │   ├── opening_loc: (11,10)-(11,11) = ":"
        │   │   │   ├── value_loc: (11,11)-(11,12) = "b"
        │   │   │   ├── closing_loc: ∅
        │   │   │   └── unescaped: "b"
        │   │   └── @ SymbolNode (location: (11,14)-(11,16))
        │   │       ├── flags: static_literal, forced_us_ascii_encoding
        │   │       ├── opening_loc: (11,14)-(11,15) = ":"
        │   │       ├── value_loc: (11,15)-(11,16) = "c"
        │   │       ├── closing_loc: ∅
        │   │       └── unescaped: "c"
        │   └── keyword_loc: (11,0)-(11,5) = "undef"
        ├── @ UndefNode (location: (13,0)-(13,12))
        │   ├── flags: newline
        │   ├── names: (length: 1)
        │   │   └── @ SymbolNode (location: (13,6)-(13,12))
        │   │       ├── flags: static_literal, forced_us_ascii_encoding
        │   │       ├── opening_loc: (13,6)-(13,8) = ":'"
        │   │       ├── value_loc: (13,8)-(13,11) = "abc"
        │   │       ├── closing_loc: (13,11)-(13,12) = "'"
        │   │       └── unescaped: "abc"
        │   └── keyword_loc: (13,0)-(13,5) = "undef"
        ├── @ UndefNode (location: (15,0)-(15,16))
        │   ├── flags: newline
        │   ├── names: (length: 1)
        │   │   └── @ InterpolatedSymbolNode (location: (15,6)-(15,16))
        │   │       ├── flags: ∅
        │   │       ├── opening_loc: (15,6)-(15,8) = ":\""
        │   │       ├── parts: (length: 2)
        │   │       │   ├── @ StringNode (location: (15,8)-(15,11))
        │   │       │   │   ├── flags: static_literal, frozen
        │   │       │   │   ├── opening_loc: ∅
        │   │       │   │   ├── content_loc: (15,8)-(15,11) = "abc"
        │   │       │   │   ├── closing_loc: ∅
        │   │       │   │   └── unescaped: "abc"
        │   │       │   └── @ EmbeddedStatementsNode (location: (15,11)-(15,15))
        │   │       │       ├── flags: ∅
        │   │       │       ├── opening_loc: (15,11)-(15,13) = "\#{"
        │   │       │       ├── statements:
        │   │       │       │   @ StatementsNode (location: (15,13)-(15,14))
        │   │       │       │   ├── flags: ∅
        │   │       │       │   └── body: (length: 1)
        │   │       │       │       └── @ IntegerNode (location: (15,13)-(15,14))
        │   │       │       │           ├── flags: static_literal, decimal
        │   │       │       │           └── value: 1
        │   │       │       └── closing_loc: (15,14)-(15,15) = "}"
        │   │       └── closing_loc: (15,15)-(15,16) = "\""
        │   └── keyword_loc: (15,0)-(15,5) = "undef"
        └── @ UndefNode (location: (17,0)-(17,14))
            ├── flags: newline
            ├── names: (length: 1)
            │   └── @ SymbolNode (location: (17,6)-(17,14))
            │       ├── flags: static_literal, forced_us_ascii_encoding
            │       ├── opening_loc: ∅
            │       ├── value_loc: (17,6)-(17,14) = "Constant"
            │       ├── closing_loc: ∅
            │       └── unescaped: "Constant"
            └── keyword_loc: (17,0)-(17,5) = "undef"
