unkown error box

poc

@@ -246,12 +246,19 @@ function dump_failure {
   printf "%5s" "  $failure_code  "
   tty_ansi FG_MAGENTA
   echo "║"
+
+  if [[ ! -v error_source ]]; then
+    echo -n '╚'
+    for ((i = 0; i < length_box; i++)); do echo -n '═'; done
+    echo '╝'
+  else
     echo -n '╚'
     for ((i = 0; i < 4; i++)); do echo -n '═'; done
     echo -n '╦'
     for ((i = 5; i < length_box; i++)); do echo -n '═'; done
     echo '╝'
     echo "     ║"
+  fi
   tty_ansi RESET
   miaou_debug '</error_box>'
 }
@@ -289,8 +296,9 @@ function load_tmp_error {
 
 function on_exit {
   trap - RETURN
-  local code="${1:-0}" last_error regex
-  miaou_debug "<on_exit code=$code>"
+  failure_code="${1:-0}"
+  local last_error regex
+  miaou_debug "<on_exit code=$failure_code>"
 
   load_tmp_error
 
@@ -298,7 +306,7 @@ function on_exit {
     last_error="${tmp_error[-1]}"
     regex='^(.*): line ([0-9]+): miaou_error: RETURN [0-9]+'
     if [[ "$last_error" =~ $regex ]]; then
-      miaou_debug "<return code=$code/>"
+      miaou_debug "<return code=$failure_code/>"
       local source line
       source="${BASH_REMATCH[1]}"
       line="${BASH_REMATCH[2]}"
@@ -314,12 +322,12 @@ function on_exit {
     add_miaou_error "${BASH_SOURCE[1]}" "${BASH_LINENO[0]}" "${failure_code}" "${failure_type}" "${failure_payload}"
     miaou_debug '<command_not_found change_stderr />'
   elif [[ ! -v failure_type ]]; then
-    if [[ $code -gt 0 && ${#tmp_error[@]} -gt 0 ]]; then
+    if [[ $failure_code -gt 0 && ${#tmp_error[@]} -gt 0 ]]; then
       last_error="${tmp_error[-1]}"
       miaou_debug "<investigate_tmp_error last={$last_error}>"
 
       regex='^(.*): line ([0-9]+): (.*): unbound variable$'
-      if [[ $code -eq 1 ]] && [[ "$last_error" =~ $regex ]]; then
+      if [[ $failure_code -eq 1 ]] && [[ "$last_error" =~ $regex ]]; then
         local source line payload
 
         source="${BASH_REMATCH[1]}"
@@ -335,7 +343,7 @@ function on_exit {
         error_lineno=("$line" "${error_lineno[@]}")
         error_funcname=("${error_funcname[@]}" '<main>')
 
-        failure_code=$code
+        failure_code=$failure_code
         failure_type='UNBOUND_VARIABLE'
         failure_payload=$payload
 
@@ -352,9 +360,11 @@ function on_exit {
   2>&3 >&3 dump_stderr
   if [[ -v failure_type ]]; then
     2>&3 >&4 dump_failure
+    if [[ -v error_source ]]; then
       2>&3 >&4 dump_stacktrace
     fi
-  if [[ $code -gt 0 ]]; then
+  fi
+  if [[ $failure_code -gt 0 ]]; then
     miaou_debug "</on_exit failure>"
   else
     miaou_debug "</on_exit success>"