test/SIL/Parser/question_mark.swift

// RUN: %target-swift-frontend %s -emit-silgen | %target-sil-opt

infix operator ??

struct A<V, E> {
}

struct B<V, E> {
}

struct C {
}

struct V1 {
}

struct E1 {
}

var buffer: A<C, B<V1, E1>?>
var buffer2: A<C, B<V1, E1>?>?