@ ProgramNode (location: (1,0)-(5,12))
├── locals: [:a]
└── statements:
    @ StatementsNode (location: (1,0)-(5,12))
    └── body: (length: 4)
        ├── @ MatchRequiredNode (location: (1,0)-(1,12))
        │   ├── value:
        │   │   @ HashNode (location: (1,0)-(1,6))
        │   │   ├── opening_loc: (1,0)-(1,1) = "{"
        │   │   ├── elements: (length: 1)
        │   │   │   └── @ AssocNode (location: (1,1)-(1,5))
        │   │   │       ├── key:
        │   │   │       │   @ SymbolNode (location: (1,1)-(1,3))
        │   │   │       │   ├── flags: forced_us_ascii_encoding
        │   │   │       │   ├── opening_loc: ∅
        │   │   │       │   ├── value_loc: (1,1)-(1,2) = "a"
        │   │   │       │   ├── closing_loc: (1,2)-(1,3) = ":"
        │   │   │       │   └── unescaped: "a"
        │   │   │       ├── value:
        │   │   │       │   @ IntegerNode (location: (1,4)-(1,5))
        │   │   │       │   ├── flags: decimal
        │   │   │       │   └── value: 0
        │   │   │       └── operator_loc: ∅
        │   │   └── closing_loc: (1,5)-(1,6) = "}"
        │   ├── pattern:
        │   │   @ HashPatternNode (location: (1,10)-(1,12))
        │   │   ├── constant: ∅
        │   │   ├── elements: (length: 1)
        │   │   │   └── @ AssocNode (location: (1,10)-(1,12))
        │   │   │       ├── key:
        │   │   │       │   @ SymbolNode (location: (1,10)-(1,12))
        │   │   │       │   ├── flags: forced_us_ascii_encoding
        │   │   │       │   ├── opening_loc: ∅
        │   │   │       │   ├── value_loc: (1,10)-(1,11) = "a"
        │   │   │       │   ├── closing_loc: (1,11)-(1,12) = ":"
        │   │   │       │   └── unescaped: "a"
        │   │   │       ├── value:
        │   │   │       │   @ ImplicitNode (location: (1,10)-(1,11))
        │   │   │       │   └── value:
        │   │   │       │       @ LocalVariableTargetNode (location: (1,10)-(1,11))
        │   │   │       │       ├── name: :a
        │   │   │       │       └── depth: 0
        │   │   │       └── operator_loc: ∅
        │   │   ├── rest: ∅
        │   │   ├── opening_loc: ∅
        │   │   └── closing_loc: ∅
        │   └── operator_loc: (1,7)-(1,9) = "=>"
        ├── @ MatchRequiredNode (location: (2,0)-(2,12))
        │   ├── value:
        │   │   @ HashNode (location: (2,0)-(2,6))
        │   │   ├── opening_loc: (2,0)-(2,1) = "{"
        │   │   ├── elements: (length: 1)
        │   │   │   └── @ AssocNode (location: (2,1)-(2,5))
        │   │   │       ├── key:
        │   │   │       │   @ SymbolNode (location: (2,1)-(2,3))
        │   │   │       │   ├── flags: forced_us_ascii_encoding
        │   │   │       │   ├── opening_loc: ∅
        │   │   │       │   ├── value_loc: (2,1)-(2,2) = "a"
        │   │   │       │   ├── closing_loc: (2,2)-(2,3) = ":"
        │   │   │       │   └── unescaped: "a"
        │   │   │       ├── value:
        │   │   │       │   @ IntegerNode (location: (2,4)-(2,5))
        │   │   │       │   ├── flags: decimal
        │   │   │       │   └── value: 0
        │   │   │       └── operator_loc: ∅
        │   │   └── closing_loc: (2,5)-(2,6) = "}"
        │   ├── pattern:
        │   │   @ HashPatternNode (location: (2,10)-(2,12))
        │   │   ├── constant: ∅
        │   │   ├── elements: (length: 1)
        │   │   │   └── @ AssocNode (location: (2,10)-(2,12))
        │   │   │       ├── key:
        │   │   │       │   @ SymbolNode (location: (2,10)-(2,12))
        │   │   │       │   ├── flags: forced_us_ascii_encoding
        │   │   │       │   ├── opening_loc: ∅
        │   │   │       │   ├── value_loc: (2,10)-(2,11) = "a"
        │   │   │       │   ├── closing_loc: (2,11)-(2,12) = ":"
        │   │   │       │   └── unescaped: "a"
        │   │   │       ├── value:
        │   │   │       │   @ ImplicitNode (location: (2,10)-(2,11))
        │   │   │       │   └── value:
        │   │   │       │       @ LocalVariableTargetNode (location: (2,10)-(2,11))
        │   │   │       │       ├── name: :a
        │   │   │       │       └── depth: 0
        │   │   │       └── operator_loc: ∅
        │   │   ├── rest: ∅
        │   │   ├── opening_loc: ∅
        │   │   └── closing_loc: ∅
        │   └── operator_loc: (2,7)-(2,9) = "=>"
        ├── @ MatchPredicateNode (location: (4,0)-(4,12))
        │   ├── value:
        │   │   @ HashNode (location: (4,0)-(4,6))
        │   │   ├── opening_loc: (4,0)-(4,1) = "{"
        │   │   ├── elements: (length: 1)
        │   │   │   └── @ AssocNode (location: (4,1)-(4,5))
        │   │   │       ├── key:
        │   │   │       │   @ SymbolNode (location: (4,1)-(4,3))
        │   │   │       │   ├── flags: forced_us_ascii_encoding
        │   │   │       │   ├── opening_loc: ∅
        │   │   │       │   ├── value_loc: (4,1)-(4,2) = "a"
        │   │   │       │   ├── closing_loc: (4,2)-(4,3) = ":"
        │   │   │       │   └── unescaped: "a"
        │   │   │       ├── value:
        │   │   │       │   @ IntegerNode (location: (4,4)-(4,5))
        │   │   │       │   ├── flags: decimal
        │   │   │       │   └── value: 0
        │   │   │       └── operator_loc: ∅
        │   │   └── closing_loc: (4,5)-(4,6) = "}"
        │   ├── pattern:
        │   │   @ HashPatternNode (location: (4,10)-(4,12))
        │   │   ├── constant: ∅
        │   │   ├── elements: (length: 1)
        │   │   │   └── @ AssocNode (location: (4,10)-(4,12))
        │   │   │       ├── key:
        │   │   │       │   @ SymbolNode (location: (4,10)-(4,12))
        │   │   │       │   ├── flags: forced_us_ascii_encoding
        │   │   │       │   ├── opening_loc: ∅
        │   │   │       │   ├── value_loc: (4,10)-(4,11) = "a"
        │   │   │       │   ├── closing_loc: (4,11)-(4,12) = ":"
        │   │   │       │   └── unescaped: "a"
        │   │   │       ├── value:
        │   │   │       │   @ ImplicitNode (location: (4,10)-(4,11))
        │   │   │       │   └── value:
        │   │   │       │       @ LocalVariableTargetNode (location: (4,10)-(4,11))
        │   │   │       │       ├── name: :a
        │   │   │       │       └── depth: 0
        │   │   │       └── operator_loc: ∅
        │   │   ├── rest: ∅
        │   │   ├── opening_loc: ∅
        │   │   └── closing_loc: ∅
        │   └── operator_loc: (4,7)-(4,9) = "in"
        └── @ MatchPredicateNode (location: (5,0)-(5,12))
            ├── value:
            │   @ HashNode (location: (5,0)-(5,6))
            │   ├── opening_loc: (5,0)-(5,1) = "{"
            │   ├── elements: (length: 1)
            │   │   └── @ AssocNode (location: (5,1)-(5,5))
            │   │       ├── key:
            │   │       │   @ SymbolNode (location: (5,1)-(5,3))
            │   │       │   ├── flags: forced_us_ascii_encoding
            │   │       │   ├── opening_loc: ∅
            │   │       │   ├── value_loc: (5,1)-(5,2) = "a"
            │   │       │   ├── closing_loc: (5,2)-(5,3) = ":"
            │   │       │   └── unescaped: "a"
            │   │       ├── value:
            │   │       │   @ IntegerNode (location: (5,4)-(5,5))
            │   │       │   ├── flags: decimal
            │   │       │   └── value: 0
            │   │       └── operator_loc: ∅
            │   └── closing_loc: (5,5)-(5,6) = "}"
            ├── pattern:
            │   @ HashPatternNode (location: (5,10)-(5,12))
            │   ├── constant: ∅
            │   ├── elements: (length: 1)
            │   │   └── @ AssocNode (location: (5,10)-(5,12))
            │   │       ├── key:
            │   │       │   @ SymbolNode (location: (5,10)-(5,12))
            │   │       │   ├── flags: forced_us_ascii_encoding
            │   │       │   ├── opening_loc: ∅
            │   │       │   ├── value_loc: (5,10)-(5,11) = "a"
            │   │       │   ├── closing_loc: (5,11)-(5,12) = ":"
            │   │       │   └── unescaped: "a"
            │   │       ├── value:
            │   │       │   @ ImplicitNode (location: (5,10)-(5,11))
            │   │       │   └── value:
            │   │       │       @ LocalVariableTargetNode (location: (5,10)-(5,11))
            │   │       │       ├── name: :a
            │   │       │       └── depth: 0
            │   │       └── operator_loc: ∅
            │   ├── rest: ∅
            │   ├── opening_loc: ∅
            │   └── closing_loc: ∅
            └── operator_loc: (5,7)-(5,9) = "in"