Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
; RUN: not llvm-as < %s 2>&1 | FileCheck %s ; CHECK: <stdin>:4:12: error: explicit pointee type doesn't match operand's pointee type (i1 vs i2) @y = global i2 0 @x = alias i1, i2* @y