where can I find this file in Magento 2?
app/code/core/Mage/Core/Block/Abstract.php
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Sign up to join this communitywhere can I find this file in Magento 2?
app/code/core/Mage/Core/Block/Abstract.php
You can find out it in below path
vendor/magento/framework/View/Element/AbstractBlock.php
It can be one of following.
vendor/magento/module-wishlist/Block/AbstractBlock.php
vendor/magento/module-backend/Block/AbstractBlock.php
vendor/magento/framework/View/Element/AbstractBlock.php