@ ProgramNode (location: (1,0)-(1,32))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(1,32))
    └── body: (length: 1)
        └── @ CallNode (location: (1,0)-(1,32))
            ├── flags: ignore_visibility
            ├── receiver: ∅
            ├── call_operator_loc: ∅
            ├── name: :m1
            ├── message_loc: (1,0)-(1,2) = "m1"
            ├── opening_loc: ∅
            ├── arguments:
            │   @ ArgumentsNode (location: (1,3)-(1,11))
            │   ├── flags: ∅
            │   └── arguments: (length: 1)
            │       └── @ KeywordHashNode (location: (1,3)-(1,11))
            │           ├── flags: symbol_keys
            │           └── elements: (length: 1)
            │               └── @ AssocNode (location: (1,3)-(1,11))
            │                   ├── key:
            │                   │   @ SymbolNode (location: (1,3)-(1,5))
            │                   │   ├── flags: forced_us_ascii_encoding
            │                   │   ├── opening_loc: (1,3)-(1,4) = ":"
            │                   │   ├── value_loc: (1,4)-(1,5) = "k"
            │                   │   ├── closing_loc: ∅
            │                   │   └── unescaped: "k"
            │                   ├── value:
            │                   │   @ CallNode (location: (1,9)-(1,11))
            │                   │   ├── flags: variable_call, ignore_visibility
            │                   │   ├── receiver: ∅
            │                   │   ├── call_operator_loc: ∅
            │                   │   ├── name: :m2
            │                   │   ├── message_loc: (1,9)-(1,11) = "m2"
            │                   │   ├── opening_loc: ∅
            │                   │   ├── arguments: ∅
            │                   │   ├── closing_loc: ∅
            │                   │   └── block: ∅
            │                   └── operator_loc: (1,6)-(1,8) = "=>"
            ├── closing_loc: ∅
            └── block:
                @ BlockNode (location: (1,12)-(1,32))
                ├── locals: []
                ├── parameters: ∅
                ├── body:
                │   @ StatementsNode (location: (1,16)-(1,27))
                │   └── body: (length: 1)
                │       └── @ CallNode (location: (1,16)-(1,27))
                │           ├── flags: ignore_visibility
                │           ├── receiver: ∅
                │           ├── call_operator_loc: ∅
                │           ├── name: :m3
                │           ├── message_loc: (1,16)-(1,18) = "m3"
                │           ├── opening_loc: (1,18)-(1,19) = "("
                │           ├── arguments: ∅
                │           ├── closing_loc: (1,19)-(1,20) = ")"
                │           └── block:
                │               @ BlockNode (location: (1,21)-(1,27))
                │               ├── locals: []
                │               ├── parameters: ∅
                │               ├── body: ∅
                │               ├── opening_loc: (1,21)-(1,23) = "do"
                │               └── closing_loc: (1,24)-(1,27) = "end"
                ├── opening_loc: (1,12)-(1,14) = "do"
                └── closing_loc: (1,29)-(1,32) = "end"
