--- a/stage1_2/iec_bison.yy	Sat Dec 06 19:14:23 2014 +0000
+++ b/stage1_2/iec_bison.yy	Wed Dec 10 11:57:43 2014 +0000
@@ -739,6 +739,8 @@
 %type  <leaf>	subrange_spec_init
 %type  <leaf>	subrange_specification
 %type  <leaf>	subrange
+/* A non standard construct, used to support the use of variables in array subranges. e.g.: ARRAY [12..max] OF INT */
+%type  <leaf>	subrange_with_var
 
 %type  <leaf>	enumerated_type_declaration
 %type  <leaf>	enumerated_spec_init
@@ -2769,9 +2771,16 @@
 ;
 
 
-subrange:
+/* a non standard construct, used to allow the declaration of array subranges using a variable */
+subrange_with_var:
   signed_integer DOTDOT signed_integer
 	{$$ = new subrange_c($1, $3, locloc(@$));}
+| any_identifier DOTDOT signed_integer
+	{$$ = new subrange_c($1, $3, locloc(@$));}
+| signed_integer DOTDOT any_identifier
+	{$$ = new subrange_c($1, $3, locloc(@$));}
+| any_identifier DOTDOT any_identifier
+	{$$ = new subrange_c($1, $3, locloc(@$));}
 /* ERROR_CHECK_BEGIN */
 | signed_integer signed_integer
 	{$$ = NULL; print_err_msg(locl(@1), locf(@2), "'..' missing between bounds in subrange definition."); yynerrs++;}
@@ -2784,6 +2793,23 @@
 /* ERROR_CHECK_END */
 ;
 
+
+subrange:
+  signed_integer DOTDOT signed_integer
+	{$$ = new subrange_c($1, $3, locloc(@$));}
+/* ERROR_CHECK_BEGIN */
+| signed_integer signed_integer
+	{$$ = NULL; print_err_msg(locl(@1), locf(@2), "'..' missing between bounds in subrange definition."); yynerrs++;}
+| signed_integer DOTDOT error
+	{$$ = NULL;
+	 if (is_current_syntax_token()) {print_err_msg(locl(@2), locf(@3), "no value defined for upper bound in subrange definition.");}
+	 else {print_err_msg(locf(@3), locl(@3), "invalid value for upper bound in subrange definition."); yyclearin;}
+	 yyerrok;
+	}
+/* ERROR_CHECK_END */
+;
+
+
 enumerated_type_declaration:
 /*  enumerated_type_name ':' enumerated_spec_init */
 /* NOTE: The 'identifier' used for the name of the new enumerated type is inserted early into the library_element_symtable so it may be used
@@ -2989,9 +3015,10 @@
 
 /* helper symbol for array_specification */
 array_subrange_list:
-  subrange
+/* the construct 'subrange' has been replaced with 'subrange_with_var' in order to support the declaration of array ranges using a varable: e.g. ARRAY [2..max] OF INT */
+  subrange_with_var
 	{$$ = new array_subrange_list_c(locloc(@$)); $$->add_element($1);}
-| array_subrange_list ',' subrange
+| array_subrange_list ',' subrange_with_var
 	{$$ = $1; $$->add_element($3);}
 /* ERROR_CHECK_BEGIN */
 | array_subrange_list subrange