FIX: crash when trying to initialise multi-dimension struct value

resolves: Oldes/Rebol-issues#2567

src/core/t-struct.c

@@ -755,12 +755,15 @@ static REBOOL parse_field_type(struct Struct_Field *field, REBVAL *spec, REBVAL
 				init = blk++;
 #endif
 				if (field->array) {
-					if (IS_INTEGER(init)) { /* interpreted as a C pointer */
-						void *ptr = (void *)VAL_INT64(init);
-
-						/* assuming it's an valid pointer and holding enough space */
-						memcpy(SERIES_SKIP(VAL_STRUCT_DATA_BIN(out), (REBCNT)offset), ptr, field->size * field->dimension);
-					} else if (IS_BLOCK(init)) {
+// O: It is probably not a good idea to let access to C pointers!
+//    https://github.com/Oldes/Rebol-issues/issues/2567
+//					if (IS_INTEGER(init)) { /* interpreted as a C pointer */
+//						void *ptr = (void *)VAL_INT64(init);
+//
+//						/* assuming it's an valid pointer and holding enough space */
+//						memcpy(SERIES_SKIP(VAL_STRUCT_DATA_BIN(out), (REBCNT)offset), ptr, field->size * field->dimension);
+//					} else 
+					if (IS_BLOCK(init)) {
 						REBCNT n = 0;
 
 						if (VAL_LEN(init) != field->dimension) {

src/tests/units/struct-test.r3

@@ -154,6 +154,12 @@ Rebol [
 		error? e: try [make struct! [ a: [uint8!] probe random 100 ]]
 		e/id = 'invalid-type
 	]
+--test-- "Invalid array type initialisation"
+;@@ https://github.com/Oldes/Rebol-issues/issues/2567
+	--assert all [
+		error? e: try [ make struct! [a: [int8! [2]] 1] ] ;- No crash!
+		e/id = 'expect-val
+	]
 ===end-group===