llvm/test/Assembler/invalid-comdat.ll - llvm-project - Git at Google

 ; RUN: not llvm-as < %s 2>&1 | FileCheck %s

 @v = global i32 0, comdat($v)
 ; CHECK: use of undefined comdat '$v'
	; RUN: not llvm-as < %s 2>&1 \| FileCheck %s

	@v = global i32 0, comdat($v)
	; CHECK: use of undefined comdat '$v'