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00875d0f83
Commit a91bf6d88 (builtin.c: builtin_source now checks that its argument is a file., 2005-12-16) fixed an infinite loop for commands like "source /" where the argument is a directory. It did so by erroring out early unless the filename argument is a regular file. This is too restrictive; it disallows reading from special files like /dev/null and fifos. Today we get a sensible error without this check, so remove it.