eweiter opened a new issue #3646: Swift 4.1 issue discovered around Structs with two Strings URL: https://github.com/apache/incubator-openwhisk/issues/3646 It was reported that the Swift 4.1 runtime was exhibiting a strange behavior. The behavior in question occurs when a Struct has multiple Strings and those Strings are being initialized directly from static Strings. For instance, the following piece of code will work: ``` struct Output: Codable { let greeting: String let group: String } func main(completion: (Output?, Error?) -> Void) -> Void { let name = "MyName" let result = Output(greeting: "Hello \(name)", group: "Greetings") print("Log greeting:\(result.greeting)") completion(result, nil) } ``` However the following code will not: ``` struct Output: Codable { let greeting: String let group: String } func main(completion: (Output?, Error?) -> Void) -> Void { let result = Output(greeting: "Hello Name", group: "bummer") print("Log greeting:\(result.greeting)") completion(result, nil) } ``` It appears to be a bug within Swift itself. We have discovered that if the code is compiled with the compiler flag to turn off optimizations then the compiling will work. This compile flag is `-Xswiftc -Onone`
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