swift: Passing a pointer in a ternary doesn't let you refer to local varible. "error: use of extraneous '&'"

func takesAPointer(_ y: UnsafeMutablePointer<OpaquePointer?>?) {
    // ...
}

var x: OpaquePointer?
takesAPointer(&x) // works
takesAPointer(true ? (&x) : nil) // test.swift:9:22: error: use of extraneous '&'

Same error with or without the inner parens. This problem showed up when calling a C API that behaves differently in the presence of an out parameter.

swift-driver version: 1.26.21 Apple Swift version 5.5.2 (swiftlang-1300.0.47.5 clang-1300.0.29.30) Target: x86_64-apple-macosx11.0