diff --git a/bin/miaou-bash b/bin/miaou-bash
index 8cff1a1..1913f8c 100755
--- a/bin/miaou-bash
+++ b/bin/miaou-bash
@@ -170,17 +170,18 @@ function on_error {
 
             elif ! is_true "$CHILD_PROCESS"; then
               # in main process only, not from children!
-              local regex2
+              local regex2 source lineno funcname
               last_error="${tmp_error[-1]}"
               regex2='^[[:space:]]+miaou_trace: source=(.*) lineno=(.*) funcname=(.*)$'
               if [[ "$last_error" =~ $regex2 ]]; then
                 miaou_debug "<miaou_trace>"
-                trace_source="${BASH_REMATCH[1]}"
-                trace_lineno="${BASH_REMATCH[2]}"
-                trace_funcname="${BASH_REMATCH[3]}"
-                extra_source=("$trace_source")
-                extra_lineno=("$trace_lineno")
-                extra_funcname=("$trace_funcname")
+                source="${BASH_REMATCH[1]}"
+                lineno="${BASH_REMATCH[2]}"
+                funcname="${BASH_REMATCH[3]}"
+                [[ "$funcname" == '<main>' ]] && funcname="$funcname (hint: prefer source than child process)"
+                extra_source=("$source")
+                extra_lineno=("$lineno")
+                extra_funcname=("$funcname")
                 # miaou_debug "<miaou_trace found_first source=${extra_source} lineno=${extra_lineno} funcname=${extra_funcname}/>"
                 # go backward
                 for ((i = ${#tmp_error[@]} - 2; i >= 0; i--)); do
@@ -190,6 +191,7 @@ function on_error {
                     source="${BASH_REMATCH[1]}"
                     lineno="${BASH_REMATCH[2]}"
                     funcname="${BASH_REMATCH[3]}"
+                    [[ "$funcname" == '<main>' ]] && funcname="$funcname (hint: prefer source than child process)"
                     extra_source=("$source" "${extra_source[@]}")
                     extra_lineno=("$lineno" "${extra_lineno[@]}")
                     extra_funcname=("$funcname" "${extra_funcname[@]}")
diff --git a/test/miaou-bash.test.bash b/test/miaou-bash.test.bash
index db022ee..cc50e57 100755
--- a/test/miaou-bash.test.bash
+++ b/test/miaou-bash.test.bash
@@ -21,15 +21,20 @@ function fail_type {
   local success regex hint_message
   success=false
   hint_message="${3:-}"
-  mapfile -t stderr <<<"$(miaou-bash ./test/stub/scenario.bash "$1" 2>&1 >/dev/null 3>/dev/null)"
-  last_error="${stderr[-1]}"
 
+  # mapfile -t stderr <<<"$(miaou-bash ./test/stub/scenario.bash "$1" 2>&1 >/dev/null 3>/dev/null)"
+
+  miaou-bash ./test/stub/scenario.bash $1 >/dev/null 2>_stderr 3>_miaou
+  mapfile -t stderr <_stderr
+
+  last_error="${stderr[-1]}"
   regex="^(.*): line ([0-9]+): miaou_error: $2 ([0-9]+)"
   [[ "${last_error}" =~ $regex ]] && success=true
 
-  # if [[ $success == true && -n "${hint_message}" ]]; then
-  #   :
-  # fi
+  if [[ $success == true && -n "${hint_message}" ]]; then
+    grep -q "${hint_message}" _miaou || success=false
+  fi
+
   if [[ $success == true ]]; then
     echo -n .
   else
@@ -58,7 +63,7 @@ fail_type exit EXIT
 fail_type command_not_found COMMAND_NOT_FOUND
 fail_type source_not_found SOURCE_NOT_FOUND
 fail_type file_not_found FILE_NOT_FOUND
-fail_type child_error CHILD_ERROR '(hint: prefer source than subshell)'
+fail_type child_error CHILD_ERROR '(hint: prefer source than child process)'
 
 failed=${#failures[@]}
 success=$((test_count - failed))