free arrays when they are out of scope

main.v: update help

vlib/builtin/array.v

@@ -5,13 +5,15 @@
 module builtin
 
 struct array {
+	is_slice bool 
+pub:
 	// Using a void pointer allows to implement arrays without generics and without generating
 	// extra code for every type.
-pub:
 	data         voidptr
 	len          int
 	cap          int
 	element_size int
+	 
 }
 
 // Private function, used by V (`nums := []int`)
@@ -144,6 +146,7 @@ pub fn (s array) slice(start, _end int) array {
 		data: s.data + start * s.element_size
 		len: l
 		cap: l
+		is_slice: true 
 	}
 	return res
 }
@@ -215,7 +218,11 @@ pub fn (a []int) str() string {
 	return res
 }
 
-pub fn (a []int) free() {
+//pub fn (a []int) free() {
+pub fn (a array) free() {
+	if a.is_slice {
+		return 
+	} 
 	C.free(a.data)
 }