Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

non_fragile_feature1.m
// RUN: %clang_cc1 -triple i386-unknown-unknown -fobjc-runtime=gcc %s
#ifndef __has_feature
#error Should have __has_feature
#endif

#if __has_feature(objc_nonfragile_abi)
#error Non-fragile ABI not used for compilation but feature macro set.
#endif