[perl #64102] [TODO] Function form of enum constructor

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# New Ticket Created by  Moritz Lenz 
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>From S12:

    There's also a pseudo-functional form:

        $x = "Today" but day(Tue);

    which lets you cheat:

        $x = "Today" but day(3);

Rakudo doesn't do that yet:

$ perl6 -e 'enum A <B C D>; say A(1).perl'
invoke() not implemented in class 'Perl6Role'
current instr.: '_block21' pc 106 (EVAL_20:57)
called from Sub '!UNIT_START' pc 17513 (src/builtins/guts.pir:350)
called from Sub 'parrot;PCT;HLLCompiler;eval' pc 950
(src/PCT/HLLCompiler.pir:527)
called from Sub 'parrot;PCT;HLLCompiler;command_line' pc 1510
(src/PCT/HLLCompiler.pir:798)
called from Sub 'parrot;Perl6;Compiler;main' pc 21852 (perl6.pir:164)