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Running bash -c '/usr/bin/ag 2 <(echo 2)' under strace yields the following: 242 191767 [main] ag 33659 open: open(/dev/fd/63/.ignore, 0x0) [...] 30 192584 [main] ag 33659 mount_info::conv_to_win32_path: src_path /proc/self/fd/63/.ignore, dst /proc/self/fd/63/.ignore, flags 0x0, rc 0 [...] 31 193366 [main] ag 33659 mount_info::conv_to_win32_path: conv_to_win32_path (pipe:[4295036184]/.ignore) [...] 31 193550 [main] ag 33659 mount_info::conv_to_win32_path: conv_to_win32_path (pipe:[4295036184]) [...] 34 193615 [main] ag 33659 symlink_info::check: 0xC0000034 = NtCreateFile (\??\C:pipe:[4295036184]) The assertion fails because the path 'C:pipe:[4295036184]' doesn't contain a backslash. But probably we should never have allowed ourselves to get to the point of considering that path. I don't have any more time to think about this today, but I'll get back to it tomorrow if no one beats me to it. Ken