.

wcfs/internal/wcfs_misc.h

@@ -63,7 +63,8 @@ public:
     // XXX empty ctor -> fd=-1, path=?
     int fd();
     string name();
-    error close();
+    //error close();
+    void close();
     error stat(struct stat *st);
 };
 

wcfs/internal/wcfs_virtmem.cpp

@@ -257,7 +257,9 @@ error _Mapping::_remmapblk(int64_t blk, Tid at) {
                 fmt::sprintf("@%s/bigfile/%s", h_(at), h_(f->foid)));
         if (err != nil)
             return err;
-        defer(fsfile.close);
+        defer([&]() {       // FIXME move out of local scope
+            fsfile.close();
+        });
     }
 
     struct stat st;