[MLton-user] Lack of information with -const 'Exn.keepHistory true'

[Stephen Weeks]

> exception SysErr(OS.SysErr(name="Invalid argument", syserror=inval)) raised.
> 
> raised at: General.o <basis>/general/general.sml 29.14
> 
>          PosixError.raiseSys <basis>/posix/error.sml 51.11

In addition to Matthew's -profile-include suggestion, since the error
is likely due to a failed system call, you could use strace to find
out the call and its arguments.