Merge branch 'singletonfix' of https://github.com/carsonmcdonald/mruby into carsonmcdonald-singletonfix

src/codegen.c

@@ -2331,6 +2331,7 @@ codegen(codegen_scope *s, node *tree, int val)
       genop(s, MKOP_ABx(OP_EXEC, cursp(), idx));
       if (val) {
         push();
+        push();
       }
     }
     break;