diff --git a/C_C++/flex/yywrap.l b/C_C++/flex/yywrap.l
new file mode 100644
index 0000000..9b4740c
--- /dev/null
+++ b/C_C++/flex/yywrap.l
@@ -0,0 +1,26 @@
+/* @BAKE
+    flex -o $*.yy.c $@
+    gcc $*.yy.c
+    ./a.out yywrap.l
+   @STOP
+ */
+%%
+
+%%
+
+int yywrap() {
+    puts("--");
+
+    fclose(yyin);
+
+    yyin = fopen(__FILE__, "r");
+
+    return 0;
+}
+
+signed main(int argc, char * argv[]) {
+    yyin = fopen(__FILE__, "r");
+    yylex();
+
+    return 0;
+}