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Rename channel

Rename main to:

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Delete main? This cannot be undone.

bracket-decl.c
#define PATHSIZE 256

static const int len = 1234;

void foo() {
  char arr[
// RUN: %clang_cc1 -fsyntax-only -code-completion-macros -code-completion-at=%s:6:12 %s -o - | FileCheck %s
// CHECK: COMPLETION: len
// CHECK: COMPLETION: PATHSIZE