code cleanup: force local var before calling a for loop, make sure it's unset when no longer needed

lib/aaa_errors.sh

@@ -26,6 +26,7 @@ function die()
     else
         prnt W "On continue malgrés l'erreur #$errorcode."
     fi
+    unset errorcode
     
     # Put the trigger back (only executed with --keepgoing)
     trap "error ${LINENO}" ERR
@@ -61,6 +62,7 @@ function error()
     else
         prnt E "Erreur ligne $(caller), avec le code d'erreur $code."
     fi
+    unset parent_lineno message code
 }
 # Trigger error function on error
 trap "error ${LINENO}; backtrace; err_exit" ERR
@@ -82,14 +84,16 @@ function backtrace
 {
     echo "======== Pile d'appel ========"
     typeset -i i=0
-    for func in "${FUNCNAME[@]}"
-    do
+    
+    local func=
+    for func in "${FUNCNAME[@]}"; do
         if [[ $i -ne 0 ]]; then
             printf '%15s() %s:%d\n' \
                 "$func" "${BASH_SOURCE[$i]}" "${BASH_LINENO[ (( $i - 1)) ]}"
         fi
         let i++ || true
     done
+    unset func i
     echo "=============================="
 }
 
@@ -111,8 +115,7 @@ noerror()
     else
         $@
     fi
-    local code=$?
-    echo $code
+    echo $?
 
     trap "error ${LINENO}" ERR
     set -o errexit