; This function contains two tail calls, which should be eliminated
-; RUN: opt < %s -tailcallelim -stats -disable-output |& grep {2 tailcallelim}
+; RUN: opt < %s -tailcallelim -stats -disable-output 2>&1 | grep "2 tailcallelim"
define i32 @Ack(i32 %M.1, i32 %N.1) {
entry: