diff --git a/bin/miaou-bash b/bin/miaou-bash
index 02747ee..d18e27b 100755
--- a/bin/miaou-bash
+++ b/bin/miaou-bash
@@ -48,6 +48,7 @@ function is_true {
 # example: alias toto="bash -c \"[[ \\\$MIAOU_DEBUG == 'true' ]] && echo yes \\\$* || echo nope\""
 function miaou_debug {
   if is_true "${MIAOU_DEBUG}"; then
+    local saved_bash_rematch=("${BASH_REMATCH[@]}") # important when regex are used before calling miaou_debug
     local i message="$*" padding=''
     local compute_hierarchy=true
     [[ ! -v miaou_debug_hierarchy ]] && miaou_debug_hierarchy=0
@@ -66,6 +67,7 @@ function miaou_debug {
       [[ "${message}" =~ $regex ]] &&
       miaou_debug_hierarchy=$((miaou_debug_hierarchy + 1)) ||
       true
+    BASH_REMATCH=("${saved_bash_rematch[@]}") # important when regex are used before calling miaou_debug
   fi
 }
 
@@ -165,12 +167,52 @@ function on_error {
               failure_type='FILE_NOT_FOUND'
               failure_payload="${BASH_REMATCH[3]}"
               miaou_debug "<file_not_found payload=${failure_payload}/>"
-            else
-              miaou_debug "<search_for_trace last={${last_error}}/>"
-              regex='^[[:space:]]*miaou_trace: '
-              if [[ "$last_error" =~ $regex ]]; then
-                miaou_debug "<trace found/>"
-                #TODO: ..
+
+            elif ! is_true "$CHILD_PROCESS"; then
+              # in main process only, not from children!
+              local regex2
+              last_error="${tmp_error[-1]}"
+              regex2='^[[:space:]]+miaou_trace: source=(.*) lineno=(.*) funcname=(.*)$'
+              if [[ "$last_error" =~ $regex2 ]]; then
+                trace_source="${BASH_REMATCH[1]}"
+                trace_lineno="${BASH_REMATCH[2]}"
+                trace_funcname="${BASH_REMATCH[3]}"
+                extra_source=("$trace_source")
+                extra_lineno=("$trace_lineno")
+                extra_funcname=("$trace_funcname")
+                miaou_debug "<miaou_trace found_first source=${extra_source} lineno=${extra_lineno} funcname=${extra_funcname}/>"
+                # go backward
+                for ((i = ${#tmp_error[@]} - 2; i >= 0; i--)); do
+                  content=${tmp_error[$i]}
+                  miaou_debug "<index i=$i content=$content>"
+                  if [[ "$content" =~ $regex2 ]]; then
+                    source="${BASH_REMATCH[1]}"
+                    lineno="${BASH_REMATCH[2]}"
+                    funcname="${BASH_REMATCH[3]}"
+                    extra_source=("$source" "${extra_source[@]}")
+                    extra_lineno=("$lineno" "${extra_lineno[@]}")
+                    extra_funcname=("$funcname" "${extra_funcname[@]}")
+                    miaou_debug '<miaou_trace found_remainders/>'
+                  else
+                    regex2='^(.*): line ([0-9]+): miaou_error: (.*) [0-9]+(.*)$'
+                    if [[ "$content" =~ $regex2 ]]; then
+                      failure_type='CHILD_ERROR'
+                      failure_payload="${BASH_REMATCH[3]}"
+                      local optional_payload
+                      optional_payload="${BASH_REMATCH[4]}"
+                      [[ -n "$optional_payload" ]] &&
+                        optional_payload="${optional_payload# payload: }" &&
+                        failure_payload="${failure_payload} ${optional_payload}"
+                      miaou_debug "<child_error type=${failure_payload} optional={${optional_payload}} found/>"
+                    else
+                      miaou_debug '<child_error no_miaou_error weird=true/>'
+                    fi
+                    break
+                  fi
+                  miaou_debug '</index>'
+                done
+                miaou_debug "<extra_trace count=${#extra_source[@]}/>"
+                miaou_debug "</miaou_trace found>"
               fi
             fi
           fi
@@ -185,9 +227,16 @@ function on_error {
     unset 'error_source[-1]' 'error_lineno[-1]' 'error_funcname[-1]'
     unset 'error_source[0]' 'error_lineno[-1]' 'error_funcname[0]'
     error_funcname[-1]='<main>'
-    error_source=("${error_source[@]}")
-    error_lineno=("${error_lineno[@]}")
-    error_funcname=("${error_funcname[@]}")
+
+    if [[ $failure_type == 'CHILD_ERROR' ]]; then
+      error_source=("${extra_source[@]}" "${error_source[@]}")
+      error_lineno=("${extra_lineno[@]}" "${error_lineno[@]}")
+      error_funcname=("${extra_funcname[@]}" "${error_funcname[@]}")
+    else
+      error_source=("${error_source[@]}")
+      error_lineno=("${error_lineno[@]}")
+      error_funcname=("${error_funcname[@]}")
+    fi
 
     if [[ -v failure_payload ]]; then
       miaou_debug "</on_error exit=$failure_code type=${failure_type} payload={${failure_payload}}>"
@@ -414,6 +463,11 @@ function on_exit {
     add_miaou_error "${BASH_SOURCE[2]}" "${BASH_LINENO[1]}" "${failure_code}" "${failure_type}" "${failure_payload}"
     miaou_debug "<file_not_found change_stderr count=${#tmp_error[@]}/>"
 
+  elif [[ -v failure_type && "$failure_type" == 'CHILD_ERROR' ]]; then
+    for ((i = 0; i < ${#extra_source[@]}; i++)); do unset 'tmp_error[-1]'; done
+    add_miaou_error "${BASH_SOURCE[2]}" "${BASH_LINENO[1]}" "${failure_code}" "${failure_type}" "${failure_payload}"
+    miaou_debug "<child_error change_stderr count=${#tmp_error[@]}/>"
+
   elif [[ ! -v failure_type ]]; then
     if [[ $failure_code -gt 0 && ${#tmp_error[@]} -gt 0 ]]; then
       last_error="${tmp_error[-1]}"
diff --git a/doc/index.md b/doc/index.md
index da40b8c..2b53121 100644
--- a/doc/index.md
+++ b/doc/index.md
@@ -36,3 +36,4 @@ count=0
 count=0
 count=$((count+1))
 ```
+
diff --git a/test/miaou-bash.test.bash b/test/miaou-bash.test.bash
index 2d052af..db022ee 100755
--- a/test/miaou-bash.test.bash
+++ b/test/miaou-bash.test.bash
@@ -21,7 +21,6 @@ function fail_type {
   local success regex hint_message
   success=false
   hint_message="${3:-}"
-  # mapfile -t stderr <<<"$(source ./test/stub/scenario.bash "$1" 2>&1 >/dev/null 3>/dev/null)"
   mapfile -t stderr <<<"$(miaou-bash ./test/stub/scenario.bash "$1" 2>&1 >/dev/null 3>/dev/null)"
   last_error="${stderr[-1]}"
 
diff --git a/test/stub/extra/onemore.bash b/test/stub/extra/onemore.bash
index 72de6de..435dbdf 100755
--- a/test/stub/extra/onemore.bash
+++ b/test/stub/extra/onemore.bash
@@ -9,11 +9,11 @@ function onemore {
 
 function do_next {
   echo do_next
-  command_not_found
+  echo $nope
+  exit 10 # youpi
   grep nope nope
+  command_not_found
   exit
-  exit 10 # youpi
-  echo $nope
   return 7
   return
 }