Weird Raku Error

--ll-exception stacktrace

Autovivifying object closures not yet implemented. Sorry.
Useless declaration of a has-scoped method in class (did you mean 'my method eval'?)
Useless declaration of a has-scoped method in class (did you mean 'my method derivative'?)
   at SETTING::src/core.c/Exception.pm6:62  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\runtime/CORE.c.setting.moarvm:throw)
 from gen\moar\World.nqp:5366  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/World.moarvm:throw)
 from gen\moar\Grammar.nqp:295  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:typed_panic)
 from gen\moar\Grammar.nqp:345  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:NYI)
 from gen\moar\Grammar.nqp:3372  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:typename)
 from <unknown>:1  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:trait_mod:sym<does>)
 from gen\moar\stage2\QRegex.nqp:1693  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\nqp\lib/QRegex.moarvm:!protoregex)
 from <unknown>:1  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:trait_mod)
 from <unknown>:1  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:trait)
 from gen\moar\Grammar.nqp:1975  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:package_def)
 from <unknown>:1  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:package_declarator:sym<class>)
 from gen\moar\stage2\QRegex.nqp:1693  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\nqp\lib/QRegex.moarvm:!protoregex)
 from <unknown>:1  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:package_declarator)
 from <unknown>:1  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:term:sym<package_declarator>)
 from gen\moar\stage2\QRegex.nqp:1693  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\nqp\lib/QRegex.moarvm:!protoregex)
 from <unknown>:1  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:term)
 from gen\moar\Grammar.nqp:3715  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:termish)
 from gen\moar\stage2\NQPHLL.nqp:1243  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\nqp\lib/NQPHLL.moarvm:EXPR)
 from gen\moar\Grammar.nqp:3758  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:EXPR)
 from gen\moar\Grammar.nqp:962  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:statement)
 from gen\moar\Grammar.nqp:890  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:statementlist)
 from gen\moar\Grammar.nqp:2217  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:package_def)
 from <unknown>:1  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:package_declarator:sym<module>)
 from gen\moar\stage2\QRegex.nqp:1693  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\nqp\lib/QRegex.moarvm:!protoregex)
 from <unknown>:1  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:package_declarator)
 from gen\moar\Grammar.nqp:2306  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:scoped)
 from <unknown>:1  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:scope_declarator:sym<unit>)
 from gen\moar\stage2\QRegex.nqp:1693  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\nqp\lib/QRegex.moarvm:!protoregex)
 from <unknown>:1  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:scope_declarator)
 from <unknown>:1  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:term:sym<scope_declarator>)
 from gen\moar\stage2\QRegex.nqp:1693  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\nqp\lib/QRegex.moarvm:!protoregex)
 from <unknown>:1  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:term)
 from gen\moar\Grammar.nqp:3715  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:termish)
 from gen\moar\stage2\NQPHLL.nqp:1243  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\nqp\lib/NQPHLL.moarvm:EXPR)
 from gen\moar\Grammar.nqp:3758  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:EXPR)
 from gen\moar\Grammar.nqp:962  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:statement)
 from gen\moar\Grammar.nqp:890  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:statementlist)
 from gen\moar\stage2\NQPHLL.nqp:1465  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\nqp\lib/NQPHLL.moarvm:LANG)
 from gen\moar\Grammar.nqp:1342  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:FOREIGN_LANG)
 from gen\moar\Grammar.nqp:838  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:comp_unit)
 from gen\moar\Grammar.nqp:553  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Grammar.moarvm:TOP)
 from gen\moar\stage2\QRegex.nqp:2256  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\nqp\lib/QRegex.moarvm:parse)
 from gen\moar\stage2\NQPHLL.nqp:2298  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\nqp\lib/NQPHLL.moarvm:parse)
 from gen\moar\stage2\NQPHLL.nqp:2214  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\nqp\lib/NQPHLL.moarvm:execute_stage)
 from gen\moar\stage2\NQPHLL.nqp:2249  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\nqp\lib/NQPHLL.moarvm:run)
 from gen\moar\stage2\NQPHLL.nqp:2245  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\nqp\lib/NQPHLL.moarvm:)
 from gen\moar\stage2\NQPHLL.nqp:2241  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\nqp\lib/NQPHLL.moarvm:compile)
 from gen\moar\stage2\NQPHLL.nqp:1916  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\nqp\lib/NQPHLL.moarvm:eval)
 from gen\moar\stage2\NQPHLL.nqp:2151  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\nqp\lib/NQPHLL.moarvm:evalfiles)
 from gen\moar\stage2\NQPHLL.nqp:2111  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\nqp\lib/NQPHLL.moarvm:command_eval)
 from gen\moar\Compiler.nqp:111  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\lib/Perl6/Compiler.moarvm:command_eval)
 from gen\moar\stage2\NQPHLL.nqp:2036  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\nqp\lib/NQPHLL.moarvm:command_line)
 from gen\moar\rakudo.nqp:127  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\runtime\perl6.moarvm:MAIN)
 from gen\moar\rakudo.nqp:1  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\runtime\perl6.moarvm:<mainline>)
 from <unknown>:1  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\runtime\perl6.moarvm:<main>)
 from <unknown>:1  (C:\Users\whoanders\scoop\apps\rakudo-star\current\bin\..\share\perl6\runtime\perl6.moarvm:<entry>)

The parsed file

use v6;

unit module ActivationFunction;

role ActivationFunction{
        method eval($z){ ... }
        method derivative($output){ ... }
}

class SigmoidAF does ActivationFunction{
        method eval($z){
                return 1 / (1 + e**$z);
        }
        method derivative($output){
                return $output * (1 - $output);
        }
}

class StepAF does ActivationFunction{
        method eval($z){
                return $z > 0 ?? 1 !! 0;
        }
        method derivative($output){
                return 1;
        }
}

Fix: add spaces between class ... does ... and the following { You just need to whitespace it correctly.
Yes, I know, it's obscure, and if you're here, you're in no better a position than me. Kudos to the folks yonder on #raku irc.