@ ProgramNode (location: (0...130))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...130))
    └── body: (length: 3)
        ├── @ DefNode (location: (0...44))
        │   ├── name: :exec
        │   ├── name_loc: (4...8) = "exec"
        │   ├── receiver: ∅
        │   ├── parameters:
        │   │   @ ParametersNode (location: (9...12))
        │   │   ├── requireds: (length: 1)
        │   │   │   └── @ RequiredParameterNode (location: (9...12))
        │   │   │       └── name: :cmd
        │   │   ├── optionals: (length: 0)
        │   │   ├── rest: ∅
        │   │   ├── posts: (length: 0)
        │   │   ├── keywords: (length: 0)
        │   │   ├── keyword_rest: ∅
        │   │   └── block: ∅
        │   ├── body:
        │   │   @ BeginNode (location: (16...44))
        │   │   ├── begin_keyword_loc: ∅
        │   │   ├── statements:
        │   │   │   @ StatementsNode (location: (16...27))
        │   │   │   └── body: (length: 1)
        │   │   │       └── @ CallNode (location: (16...27))
        │   │   │           ├── receiver: ∅
        │   │   │           ├── call_operator_loc: ∅
        │   │   │           ├── message_loc: (16...22) = "system"
        │   │   │           ├── opening_loc: (22...23) = "("
        │   │   │           ├── arguments:
        │   │   │           │   @ ArgumentsNode (location: (23...26))
        │   │   │           │   └── arguments: (length: 1)
        │   │   │           │       └── @ LocalVariableReadNode (location: (23...26))
        │   │   │           │           ├── name: :cmd
        │   │   │           │           └── depth: 0
        │   │   │           ├── closing_loc: (26...27) = ")"
        │   │   │           ├── block: ∅
        │   │   │           ├── flags: ∅
        │   │   │           └── name: "system"
        │   │   ├── rescue_clause:
        │   │   │   @ RescueNode (location: (28...40))
        │   │   │   ├── keyword_loc: (28...34) = "rescue"
        │   │   │   ├── exceptions: (length: 0)
        │   │   │   ├── operator_loc: ∅
        │   │   │   ├── reference: ∅
        │   │   │   ├── statements:
        │   │   │   │   @ StatementsNode (location: (37...40))
        │   │   │   │   └── body: (length: 1)
        │   │   │   │       └── @ NilNode (location: (37...40))
        │   │   │   └── consequent: ∅
        │   │   ├── else_clause: ∅
        │   │   ├── ensure_clause: ∅
        │   │   └── end_keyword_loc: (41...44) = "end"
        │   ├── locals: [:cmd]
        │   ├── def_keyword_loc: (0...3) = "def"
        │   ├── operator_loc: ∅
        │   ├── lparen_loc: (8...9) = "("
        │   ├── rparen_loc: (12...13) = ")"
        │   ├── equal_loc: ∅
        │   └── end_keyword_loc: (41...44) = "end"
        ├── @ DefNode (location: (47...89))
        │   ├── name: :exec
        │   ├── name_loc: (51...55) = "exec"
        │   ├── receiver: ∅
        │   ├── parameters:
        │   │   @ ParametersNode (location: (56...59))
        │   │   ├── requireds: (length: 1)
        │   │   │   └── @ RequiredParameterNode (location: (56...59))
        │   │   │       └── name: :cmd
        │   │   ├── optionals: (length: 0)
        │   │   ├── rest: ∅
        │   │   ├── posts: (length: 0)
        │   │   ├── keywords: (length: 0)
        │   │   ├── keyword_rest: ∅
        │   │   └── block: ∅
        │   ├── body:
        │   │   @ StatementsNode (location: (63...85))
        │   │   └── body: (length: 1)
        │   │       └── @ RescueModifierNode (location: (63...85))
        │   │           ├── expression:
        │   │           │   @ CallNode (location: (63...74))
        │   │           │   ├── receiver: ∅
        │   │           │   ├── call_operator_loc: ∅
        │   │           │   ├── message_loc: (63...69) = "system"
        │   │           │   ├── opening_loc: (69...70) = "("
        │   │           │   ├── arguments:
        │   │           │   │   @ ArgumentsNode (location: (70...73))
        │   │           │   │   └── arguments: (length: 1)
        │   │           │   │       └── @ LocalVariableReadNode (location: (70...73))
        │   │           │   │           ├── name: :cmd
        │   │           │   │           └── depth: 0
        │   │           │   ├── closing_loc: (73...74) = ")"
        │   │           │   ├── block: ∅
        │   │           │   ├── flags: ∅
        │   │           │   └── name: "system"
        │   │           ├── keyword_loc: (75...81) = "rescue"
        │   │           └── rescue_expression:
        │   │               @ NilNode (location: (82...85))
        │   ├── locals: [:cmd]
        │   ├── def_keyword_loc: (47...50) = "def"
        │   ├── operator_loc: ∅
        │   ├── lparen_loc: (55...56) = "("
        │   ├── rparen_loc: (59...60) = ")"
        │   ├── equal_loc: ∅
        │   └── end_keyword_loc: (86...89) = "end"
        └── @ DefNode (location: (92...130))
            ├── name: :exec
            ├── name_loc: (96...100) = "exec"
            ├── receiver: ∅
            ├── parameters:
            │   @ ParametersNode (location: (101...104))
            │   ├── requireds: (length: 1)
            │   │   └── @ RequiredParameterNode (location: (101...104))
            │   │       └── name: :cmd
            │   ├── optionals: (length: 0)
            │   ├── rest: ∅
            │   ├── posts: (length: 0)
            │   ├── keywords: (length: 0)
            │   ├── keyword_rest: ∅
            │   └── block: ∅
            ├── body:
            │   @ StatementsNode (location: (108...130))
            │   └── body: (length: 1)
            │       └── @ RescueModifierNode (location: (108...130))
            │           ├── expression:
            │           │   @ CallNode (location: (108...119))
            │           │   ├── receiver: ∅
            │           │   ├── call_operator_loc: ∅
            │           │   ├── message_loc: (108...114) = "system"
            │           │   ├── opening_loc: (114...115) = "("
            │           │   ├── arguments:
            │           │   │   @ ArgumentsNode (location: (115...118))
            │           │   │   └── arguments: (length: 1)
            │           │   │       └── @ LocalVariableReadNode (location: (115...118))
            │           │   │           ├── name: :cmd
            │           │   │           └── depth: 0
            │           │   ├── closing_loc: (118...119) = ")"
            │           │   ├── block: ∅
            │           │   ├── flags: ∅
            │           │   └── name: "system"
            │           ├── keyword_loc: (120...126) = "rescue"
            │           └── rescue_expression:
            │               @ NilNode (location: (127...130))
            ├── locals: [:cmd]
            ├── def_keyword_loc: (92...95) = "def"
            ├── operator_loc: ∅
            ├── lparen_loc: (100...101) = "("
            ├── rparen_loc: (104...105) = ")"
            ├── equal_loc: (106...107) = "="
            └── end_keyword_loc: ∅
