koher

struct Foo { var a: Int var b: Int init() { a = 2 b = [2, 3, 5].reduce(0) { $0 + $1 + a } } }

Version:

swift-4.1.1-RELEASE

Output:

Error:

/usercode/main.swift:7:33: error: variable 'self.b' captured by a closure before being initialized b = [2, 3, 5].reduce(0) { $0 + $1 + a } ^