memo:
```bash
> ruby -e 'v &&= 117' --parser=prism --dump=parsetree
@ ProgramNode (location: (1,0)-(1,9))
+-- locals: [:v]
+-- statements:
    @ StatementsNode (location: (1,0)-(1,9))
    +-- body: (length: 1)
        +-- @ LocalVariableAndWriteNode (location: (1,0)-(1,9))
            +-- name_loc: (1,0)-(1,1) = "v"
            +-- operator_loc: (1,2)-(1,5) = "&&="
            +-- value:
            |   @ IntegerNode (location: (1,6)-(1,9))
            |   +-- IntegerBaseFlags: decimal
            |   +-- value: 117
            +-- name: :v
            +-- depth: 0

> ruby -e 'v ||= 117' --parser=prism --dump=parsetree
@ ProgramNode (location: (1,0)-(1,9))
+-- locals: [:v]
+-- statements:
    @ StatementsNode (location: (1,0)-(1,9))
    +-- body: (length: 1)
        +-- @ LocalVariableOrWriteNode (location: (1,0)-(1,9))
            +-- name_loc: (1,0)-(1,1) = "v"
            +-- operator_loc: (1,2)-(1,5) = "||="
            +-- value:
            |   @ IntegerNode (location: (1,6)-(1,9))
            |   +-- IntegerBaseFlags: decimal
            |   +-- value: 117
            +-- name: :v
            +-- depth: 0
```