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omochimetaru
@swift-5.5.3 func foo() { let a: Void let b: Int }
stderr:<stdin>:2:7: warning: immutable value 'a' was never used; consider replacing with '_' or removing it let a: Void ^ _ <stdin>:3:7: warning: immutable value 'b' was never used; consider replacing with '_' or removing it let b: Int ^ _