test/TableGen/BitsInitOverflow.td - llvm-project/llvm - Git at Google

 // RUN: not llvm-tblgen %s 2> /dev/null

 def {
   bits<2> X = 5;  // bitfield is too small, reject
 }
	// RUN: not llvm-tblgen %s 2> /dev/null

	def {
	bits<2> X = 5; // bitfield is too small, reject
	}