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Theorem truncate-empty

afs-cons(dirs, files), inode = mkinode(ino, md, false, m, n0, n), pageno = inode.size / VFS_PAGE_SIZE, buf-opt.none? ⊦ [afs_truncate#(n, pageno; buf-opt, inode, bv, err, dirs, files, asynced)] (err = ESUCCESS → files[ino].content.stream from n = σ⊥)

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