KtOperationReferenceExpression(135,137): '+='
  isImplicitReferenceToCompanion: false
  contextSensitiveResolutionStatus: NotAvailable
  lookupLocally: false
  KaSymbolResolutionSuccess:
    symbols = [
      kotlin/Int.plus(<dispatch receiver>: kotlin.Int, other: kotlin.Int): kotlin.Int,
      /MyMap.set(<dispatch receiver>: MyMap<K, V>, k: K, v: V): kotlin.Unit
    ]
