@ ProgramNode (location: (1,0)-(13,43))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(13,43))
    └── body: (length: 3)
        ├── @ DefNode (location: (1,0)-(5,3))
        │   ├── name: :exec
        │   ├── name_loc: (1,9)-(1,13) = "exec"
        │   ├── receiver:
        │   │   @ SelfNode (location: (1,4)-(1,8))
        │   ├── parameters:
        │   │   @ ParametersNode (location: (1,14)-(1,17))
        │   │   ├── requireds: (length: 1)
        │   │   │   └── @ RequiredParameterNode (location: (1,14)-(1,17))
        │   │   │       ├── flags: ∅
        │   │   │       └── name: :cmd
        │   │   ├── optionals: (length: 0)
        │   │   ├── rest: ∅
        │   │   ├── posts: (length: 0)
        │   │   ├── keywords: (length: 0)
        │   │   ├── keyword_rest: ∅
        │   │   └── block: ∅
        │   ├── body:
        │   │   @ BeginNode (location: (1,0)-(5,3))
        │   │   ├── begin_keyword_loc: ∅
        │   │   ├── statements:
        │   │   │   @ StatementsNode (location: (2,2)-(2,13))
        │   │   │   └── body: (length: 1)
        │   │   │       └── @ CallNode (location: (2,2)-(2,13))
        │   │   │           ├── flags: ignore_visibility
        │   │   │           ├── receiver: ∅
        │   │   │           ├── call_operator_loc: ∅
        │   │   │           ├── name: :system
        │   │   │           ├── message_loc: (2,2)-(2,8) = "system"
        │   │   │           ├── opening_loc: (2,8)-(2,9) = "("
        │   │   │           ├── arguments:
        │   │   │           │   @ ArgumentsNode (location: (2,9)-(2,12))
        │   │   │           │   ├── flags: ∅
        │   │   │           │   └── arguments: (length: 1)
        │   │   │           │       └── @ LocalVariableReadNode (location: (2,9)-(2,12))
        │   │   │           │           ├── name: :cmd
        │   │   │           │           └── depth: 0
        │   │   │           ├── closing_loc: (2,12)-(2,13) = ")"
        │   │   │           └── block: ∅
        │   │   ├── rescue_clause:
        │   │   │   @ RescueNode (location: (3,0)-(4,5))
        │   │   │   ├── keyword_loc: (3,0)-(3,6) = "rescue"
        │   │   │   ├── exceptions: (length: 0)
        │   │   │   ├── operator_loc: ∅
        │   │   │   ├── reference: ∅
        │   │   │   ├── statements:
        │   │   │   │   @ StatementsNode (location: (4,2)-(4,5))
        │   │   │   │   └── body: (length: 1)
        │   │   │   │       └── @ NilNode (location: (4,2)-(4,5))
        │   │   │   └── consequent: ∅
        │   │   ├── else_clause: ∅
        │   │   ├── ensure_clause: ∅
        │   │   └── end_keyword_loc: (5,0)-(5,3) = "end"
        │   ├── locals: [:cmd]
        │   ├── def_keyword_loc: (1,0)-(1,3) = "def"
        │   ├── operator_loc: (1,8)-(1,9) = "."
        │   ├── lparen_loc: (1,13)-(1,14) = "("
        │   ├── rparen_loc: (1,17)-(1,18) = ")"
        │   ├── equal_loc: ∅
        │   └── end_keyword_loc: (5,0)-(5,3) = "end"
        ├── @ DefNode (location: (8,0)-(10,3))
        │   ├── name: :exec
        │   ├── name_loc: (8,9)-(8,13) = "exec"
        │   ├── receiver:
        │   │   @ SelfNode (location: (8,4)-(8,8))
        │   ├── parameters:
        │   │   @ ParametersNode (location: (8,14)-(8,17))
        │   │   ├── requireds: (length: 1)
        │   │   │   └── @ RequiredParameterNode (location: (8,14)-(8,17))
        │   │   │       ├── flags: ∅
        │   │   │       └── name: :cmd
        │   │   ├── optionals: (length: 0)
        │   │   ├── rest: ∅
        │   │   ├── posts: (length: 0)
        │   │   ├── keywords: (length: 0)
        │   │   ├── keyword_rest: ∅
        │   │   └── block: ∅
        │   ├── body:
        │   │   @ StatementsNode (location: (9,2)-(9,24))
        │   │   └── body: (length: 1)
        │   │       └── @ RescueModifierNode (location: (9,2)-(9,24))
        │   │           ├── expression:
        │   │           │   @ CallNode (location: (9,2)-(9,13))
        │   │           │   ├── flags: ignore_visibility
        │   │           │   ├── receiver: ∅
        │   │           │   ├── call_operator_loc: ∅
        │   │           │   ├── name: :system
        │   │           │   ├── message_loc: (9,2)-(9,8) = "system"
        │   │           │   ├── opening_loc: (9,8)-(9,9) = "("
        │   │           │   ├── arguments:
        │   │           │   │   @ ArgumentsNode (location: (9,9)-(9,12))
        │   │           │   │   ├── flags: ∅
        │   │           │   │   └── arguments: (length: 1)
        │   │           │   │       └── @ LocalVariableReadNode (location: (9,9)-(9,12))
        │   │           │   │           ├── name: :cmd
        │   │           │   │           └── depth: 0
        │   │           │   ├── closing_loc: (9,12)-(9,13) = ")"
        │   │           │   └── block: ∅
        │   │           ├── keyword_loc: (9,14)-(9,20) = "rescue"
        │   │           └── rescue_expression:
        │   │               @ NilNode (location: (9,21)-(9,24))
        │   ├── locals: [:cmd]
        │   ├── def_keyword_loc: (8,0)-(8,3) = "def"
        │   ├── operator_loc: (8,8)-(8,9) = "."
        │   ├── lparen_loc: (8,13)-(8,14) = "("
        │   ├── rparen_loc: (8,17)-(8,18) = ")"
        │   ├── equal_loc: ∅
        │   └── end_keyword_loc: (10,0)-(10,3) = "end"
        └── @ DefNode (location: (13,0)-(13,43))
            ├── name: :exec
            ├── name_loc: (13,9)-(13,13) = "exec"
            ├── receiver:
            │   @ SelfNode (location: (13,4)-(13,8))
            ├── parameters:
            │   @ ParametersNode (location: (13,14)-(13,17))
            │   ├── requireds: (length: 1)
            │   │   └── @ RequiredParameterNode (location: (13,14)-(13,17))
            │   │       ├── flags: ∅
            │   │       └── name: :cmd
            │   ├── optionals: (length: 0)
            │   ├── rest: ∅
            │   ├── posts: (length: 0)
            │   ├── keywords: (length: 0)
            │   ├── keyword_rest: ∅
            │   └── block: ∅
            ├── body:
            │   @ StatementsNode (location: (13,21)-(13,43))
            │   └── body: (length: 1)
            │       └── @ RescueModifierNode (location: (13,21)-(13,43))
            │           ├── expression:
            │           │   @ CallNode (location: (13,21)-(13,32))
            │           │   ├── flags: ignore_visibility
            │           │   ├── receiver: ∅
            │           │   ├── call_operator_loc: ∅
            │           │   ├── name: :system
            │           │   ├── message_loc: (13,21)-(13,27) = "system"
            │           │   ├── opening_loc: (13,27)-(13,28) = "("
            │           │   ├── arguments:
            │           │   │   @ ArgumentsNode (location: (13,28)-(13,31))
            │           │   │   ├── flags: ∅
            │           │   │   └── arguments: (length: 1)
            │           │   │       └── @ LocalVariableReadNode (location: (13,28)-(13,31))
            │           │   │           ├── name: :cmd
            │           │   │           └── depth: 0
            │           │   ├── closing_loc: (13,31)-(13,32) = ")"
            │           │   └── block: ∅
            │           ├── keyword_loc: (13,33)-(13,39) = "rescue"
            │           └── rescue_expression:
            │               @ NilNode (location: (13,40)-(13,43))
            ├── locals: [:cmd]
            ├── def_keyword_loc: (13,0)-(13,3) = "def"
            ├── operator_loc: (13,8)-(13,9) = "."
            ├── lparen_loc: (13,13)-(13,14) = "("
            ├── rparen_loc: (13,17)-(13,18) = ")"
            ├── equal_loc: (13,19)-(13,20) = "="
            └── end_keyword_loc: ∅