Don't include e.g. home or root directories as a module path

gistfile1.txt

C:\Users\ugexe>raku --ll-exception -e "use lib '.'; use Test;"
read from dirhandle failed: 123
   at SETTING::src/core.c/Rakudo/Internals.pm6:1345  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\runtime/CORE.c.setting.moarvm:next)
 from SETTING::src/core.c/Rakudo/Internals.pm6:1374  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\runtime/CORE.c.setting.moarvm:pull-one)
 from SETTING::src/core.c/Any-iterable-methods.pm6:326  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\runtime/CORE.c.setting.moarvm:pull-one)
 from SETTING::src/core.c/Any-iterable-methods.pm6:335  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\runtime/CORE.c.setting.moarvm:pull-one)
 from SETTING::src/core.c/CompUnit/Repository/FileSystem.pm6:283  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\runtime/CORE.c.setting.moarvm:dist-from-ls)
 from SETTING::src/core.c/CompUnit/Repository/FileSystem.pm6:238  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\runtime/CORE.c.setting.moarvm:distribution)
 from SETTING::src/core.c/CompUnit/Repository/FileSystem.pm6:160  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\runtime/CORE.c.setting.moarvm:candidates)
 from SETTING::src/core.c/CompUnit/Repository/FileSystem.pm6:19  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\runtime/CORE.c.setting.moarvm:matching-dist)
 from SETTING::src/core.c/CompUnit/Repository/FileSystem.pm6:76  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\runtime/CORE.c.setting.moarvm:need)
 from gen\moar\World.nqp:1475  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\lib/Perl6/World.moarvm:load_module)
 from gen\moar\World.nqp:1425  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\lib/Perl6/World.moarvm:do_pragma_or_load_module)
 from gen\moar\Grammar.nqp:1314  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\lib/Perl6/Grammar.moarvm:statement_control:sym<use>)
 from gen\moar\stage2\QRegex.nqp:1704  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\nqp\lib/QRegex.moarvm:!protoregex)
 from <unknown>:1  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\lib/Perl6/Grammar.moarvm:statement_control)
 from gen\moar\Grammar.nqp:962  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\lib/Perl6/Grammar.moarvm:statement)
 from gen\moar\Grammar.nqp:890  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\lib/Perl6/Grammar.moarvm:statementlist)
 from gen\moar\stage2\NQPHLL.nqp:1465  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\nqp\lib/NQPHLL.moarvm:LANG)
 from gen\moar\Grammar.nqp:1342  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\lib/Perl6/Grammar.moarvm:FOREIGN_LANG)
 from gen\moar\Grammar.nqp:838  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\lib/Perl6/Grammar.moarvm:comp_unit)
 from gen\moar\Grammar.nqp:553  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\lib/Perl6/Grammar.moarvm:TOP)
 from gen\moar\stage2\QRegex.nqp:2267  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\nqp\lib/QRegex.moarvm:parse)
 from gen\moar\stage2\NQPHLL.nqp:2295  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\nqp\lib/NQPHLL.moarvm:parse)
 from gen\moar\stage2\NQPHLL.nqp:2211  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\nqp\lib/NQPHLL.moarvm:execute_stage)
 from gen\moar\stage2\NQPHLL.nqp:2246  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\nqp\lib/NQPHLL.moarvm:run)
 from gen\moar\stage2\NQPHLL.nqp:2242  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\nqp\lib/NQPHLL.moarvm:)
 from gen\moar\stage2\NQPHLL.nqp:2238  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\nqp\lib/NQPHLL.moarvm:compile)
 from gen\moar\stage2\NQPHLL.nqp:1913  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\nqp\lib/NQPHLL.moarvm:eval)
 from gen\moar\stage2\NQPHLL.nqp:2053  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\nqp\lib/NQPHLL.moarvm:)
 from gen\moar\stage2\NQPHLL.nqp:2108  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\nqp\lib/NQPHLL.moarvm:command_eval)
 from gen\moar\Compiler.nqp:111  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\lib/Perl6/Compiler.moarvm:command_eval)
 from gen\moar\stage2\NQPHLL.nqp:2033  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\nqp\lib/NQPHLL.moarvm:command_line)
 from gen\moar\rakudo.nqp:127  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\runtime\perl6.moarvm:MAIN)
 from gen\moar\rakudo.nqp:1  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\runtime\perl6.moarvm:<mainline>)
 from <unknown>:1  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\runtime\perl6.moarvm:<main>)
 from <unknown>:1  (C:\Users\ugexe\.rakudobrew\moar-2021.10\install\share\perl6\runtime\perl6.moarvm:<entry>)