kateinoigakukun

struct A<T> { } extension A where T == Bool { typealias B = String } extension A { typealias B = Int }

Version:

swift-4.1.1-RELEASE

Output:

Error:

/usercode/main.swift:7:13: error: invalid redeclaration of 'B' typealias B = Int ^ /usercode/main.swift:4:13: note: 'B' previously declared here typealias B = String ^