# RUN: not llc -o /dev/null %s -march=x86-64 -run-pass none 2>&1 | FileCheck %s
# This test ensures that an error is reported for specifying the register class
# of a physical register.
--- |
  define void @t() { ret void }
...
---
name: t
body: |
  bb.0:
    ; CHECK: [[@LINE+1]]:10: register class specification expects a virtual register
    $eax : gr32 = COPY $rdx
...