...
`-VarDecl 0x55f183b86f68 <col:3, col:16> col:5 s 'S' listinit
  `-InitListExpr 0x55f183b87110 <col:6, col:16> 'S'
    |-IntegerLiteral 0x55f183b86fd0 <col:7> 'int' 2
    `-InitListExpr 0x55f183b87160 <col:9, col:15> 'unsigned int [2]'
      |-ImplicitCastExpr 0x55f183b871b0 <col:10, col:12> 'unsigned int' <IntegralCast>
      | `-BinaryOperator 0x55f183b87030 <col:10, col:12> 'int' '+'
      |   |-IntegerLiteral 0x55f183b86ff0 <col:10> 'int' 4
      |   `-IntegerLiteral 0x55f183b87010 <col:12> 'int' 4
      `-ImplicitCastExpr 0x55f183b871c8 <col:14> 'unsigned int' <IntegralCast>
        `-IntegerLiteral 0x55f183b87050 <col:14> 'int' 5