KtOperationReferenceExpression(189,191): '+='
  isImplicitReferenceToCompanion: false
  contextSensitiveResolutionStatus: NotAvailable
  lookupLocally: false
  KaSymbolResolutionSuccess:
    symbols = [
      kotlin/Int.plus(<dispatch receiver>: kotlin.Int, other: kotlin.Int): kotlin.Int,
      /Foo.set(<extension receiver>: MyMap<K2, V2>, <dispatch receiver>: Foo, k: K2, v: V2): kotlin.Unit
    ]
