scripts/base in rvm-1.0.10 vs scripts/base in rvm-1.0.11

@@ -28,9 +28,13 @@
   #fi
 
 if [[ ${rvm_trace_flag:-0} -gt 0 ]]; then
   export rvm_trace_flag=1
   set -o xtrace
+
+  if [[ -z "${ZSH_VERSION:-""}" ]] ; then
+    export PS4='+[${BASH_SOURCE}] : ${LINENO} : ${FUNCNAME[0]:+${FUNCNAME[0]}() $ }'
+  fi
 fi
 
 if [[ -n "${ZSH_VERSION:-""}" ]] ; then
   __array_start=1
 else