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The autocommit-off mode works by issuing an implicit BEGIN just before any command that is not already in a transaction block and is not itself a BEGIN or other transaction-control command, nor a command that cannot be executed inside a transaction block. This commit prevents psql from issuing such an implicit BEGIN before ALTER SYSTEM because it's not allowed inside a transaction block. Backpatch to 9.4 where ALTER SYSTEM was added. Report by Feike Steenbergen