import Foundation

func test(_ work: () throws -> Void) throws {
    try work()
}

do {
    try test {
        
/* Error is not handled because the enclosing function is not declared 'throws' */
        defer { throw NSError(domain: "", code: 0, userInfo: nil) }
        
        print("hello")
    }
    
} catch {
     print(error.localizedDescription)
}