enhanced the compiler to prohibit variable declaration in class init scope

t/err.sh

@@ -3,7 +3,7 @@
 for i in $@; do :; done
 script="$i"
 
-expected_errinfo=$(grep -E "##[[:space:]]+ERROR:" "$script" 2>/dev/null)
+expected_errinfo=$(grep -n -o -E "##ERROR: .+" "$script" 2>/dev/null)
 [ -z "$expected_errinfo" ] && {
 	echo "INVALID TESTER - $script contains no ERROR information"
 	exit 1
@@ -11,11 +11,13 @@ expected_errinfo=$(grep -E "##[[:space:]]+ERROR:" "$script" 2>/dev/null)
 
 expected_errline=$(echo $expected_errinfo | cut -d: -f1)
 xlen=$(echo $expected_errline | wc -c)
-xlen=$(expr $xlen + 2)
+xlen=$(expr $xlen + 10)
 expected_errmsg=$(echo $expected_errinfo | cut -c${xlen}-)
 
 output=$($@ 2>&1) 
-echo "$output" | grep -E "ERROR:.+${script}.+${expected_errmsg}" || {
+## the regular expression is not escaped properly. the error information must not
+## include specifial regex characters to avoid problems.
+echo "$output" | grep -E "ERROR:.+${script}\[${expected_errline},[[:digit:]]+\] ${expected_errmsg}" || {
 	echo "$script - $output"
 	exit 1
 }