t.ae

struct X {} struct Y { static func f(_ x: X) -> X { print("Y") return x } } let x = X() let _: X = .f(x)

Version:

swift-5.1-RELEASE

Output:

Error:

/usercode/main.swift:11:13: error: type 'X' has no member 'f' let _: X = .f(x) ~^~~~