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Kishikawa Katsumi
@swift-5.1.5 var output: TextOutputStream = "" print("", to: &output)
swift51 BOT 4/12/2023 12:55 AM
exit status: 1 with <stdin>:2:1: error: protocol type 'TextOutputStream' cannot conform to 'TextOutputStream' because only concrete types can conform to protocols print("", to: &output) ^