Result initializer works in for loop but not map?

[getaaron]

This code compiles without issue, where generatedEvents is of type [EKEvent] and eventStore is an EKEventStore:

for thisEvent in generatedEvents {
    let result = Result(try eventStore.save(thisEvent, span: .thisEvent, commit: false))
    print(result)
}

However, when I rewrite it as a map (to generate an array of Results):

let results = generatedEvents.map { thisEvent -> Result<(), AnyError> in
    let result = Result(try eventStore.save(thisEvent, span: .thisEvent, commit: false))
    print(result)
    return result
}

I receive the compiler error:

Call can throw, but it is not marked with 'try' and the error is not handled

However, looking at the Result initializer, it looks like the error is handled in a do/catch block.

[gstro]

Not sure if you've moved past this, but it looks like something to do with the @autoclosure (could be a Swift bug?). One way to get this to work is to use curly braces instead of parentheses:

let result = Result { try eventStore.save(thisEvent, span: .thisEvent, commit: false) }

Here's an example I came up with to experiment:

extension String {
	func functionThatThrows() throws {
		_ = try String(contentsOf: URL(fileURLWithPath: NSTemporaryDirectory()))
	}
}

func example() {
	let strings = ["Hello,", "world!"]

	for string in strings {
		let result = Result(try string.functionThatThrows())  // works
		print(result)
	}

	let results = strings.map { string -> Result<(), AnyError> in
		let result = Result { try string.functionThatThrows() } // works 
//		let result = Result(try string.functionThatThrows())	// doesn't work
		print(result)
		return result
	}
	print(results)
}