llvm/test/tools/llvm-mc/basic.test - llvm-project - Git at Google

 # RUN: not llvm-mc %t.blah -o /dev/null 2>&1 | FileCheck -DMSG=%errc_ENOENT --check-prefix=ENOENT %s

 # ENOENT: {{.*}}.blah: [[MSG]]
	# RUN: not llvm-mc %t.blah -o /dev/null 2>&1 \| FileCheck -DMSG=%errc_ENOENT --check-prefix=ENOENT %s

	# ENOENT: {{.*}}.blah: [[MSG]]