cgen: fix codegen for struct field with a shared array of points (#13222)

vlib/v/gen/c/cgen.v

@@ -6160,7 +6160,7 @@ fn (mut g Gen) type_default(typ_ ast.Type) string {
 			noscan := g.check_noscan(elem_typ)
 			init_str := '__new_array${noscan}(0, 0, sizeof($elem_type_str))'
 			if typ.has_flag(.shared_f) {
-				atyp := '__shared__Array_${g.table.sym(elem_typ).cname}'
+				atyp := '__shared__$sym.cname'
 				return '($atyp*)__dup_shared_array(&($atyp){.mtx = {0}, .val =$init_str}, sizeof($atyp))'
 			} else {
 				return init_str

vlib/v/tests/shared_array_ptr_test.v

@@ -0,0 +1,12 @@
+struct AA {
+mut:
+	a shared []&int
+}
+
+fn test_shared_array_ptr() {
+	mut a := AA{}
+	b := 3
+	lock a.a {
+		a.a << &b
+	}
+}