Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
// RUN: not llvm-mc -triple aarch64 -filetype asm -o - %s 2>&1 | FileCheck %s .arch_extension nosve ptrue p0.b, pow2 // CHECK: error: instruction requires: sve or sme // CHECK-NEXT: ptrue p0.b, pow2