Report when package dir doesn't exist instead of silently raising ENOENT#18
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Currently
doCheckfails with an unhandled SysErr (ENOENT) when the package dir does not exist inlib. This is confusing as there is no user-facing information about what's going on. I figured this out by printf-debugging.By replacing Os.FileSys.isDir with the non-raising System.doesDirExist, the issue is solved and the error is printed out nicely for the user.