Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

variant-diagnostics.s
# RUN: not llvm-mc -triple i386-linux-gnu -filetype asm -o /dev/null 2>&1 %s \
# RUN:   | FileCheck %s

	.text

function:
	call external@invalid

# CHECK: error: invalid variant 'invalid'
# CHECK: 	call external@invalid
# CHECK:                      ^