// If replace is non-nil, Child calls replace(x) where x is
// the current child inode with the given name. If possible,
// the child inode is replaced with the one returned by
// If replace is non-nil, Child calls replace(x) where x is
// the current child inode with the given name. If possible,
// the child inode is replaced with the one returned by
// call nca.FS().Rename() instead of proceeding. Until then
// it's awkward for filesystems to implement their own Rename
// methods effectively: the only one that runs is the one on
// call nca.FS().Rename() instead of proceeding. Until then
// it's awkward for filesystems to implement their own Rename
// methods effectively: the only one that runs is the one on