Hi,
I found a very rare situation that closure can’t infer the type of its parameter. See the code below:
func withReference<T, Result>(_ value: inout T, _ execute: (inout T) throws -> Result) rethrows -> Result { return try execute(&value) } struct Person { var name: String } var p = Person(name: "a") withReference(&p) { (v) in v.name = "1" } print(p)
The code can be compiled and produce correct result in Swift 3(Xcode 8) playground, but it can’t be compiled in Swift 4(Xcode 9 beta2).
The error says:
error: bug.playground:11:7: error: type of expression is ambiguous without more context
v.name = "1"
~~^~~~
Is this related to exclusive access rule introduced to Swift 4?
Regards,
Yilei He