Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
struct IncompleteType; void foo() { IncompleteType *f; f->x; } // RUN: not %clang_cc1 -fsyntax-only -code-completion-at=%s:5:6 %s -o - | FileCheck %s -allow-empty // CHECK-NOT: COMPLETION: