[perl #73640] [BUG] Strange failure in perl6-actions.pir when parsing '.++()' in Rakudo

[Carl Mäsak]

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<diakopter> rakudo: .++()
<p6eval> rakudo e4e058: OUTPUT«Method 'unshift' not found for invocant
of class 'Undef'␤current instr.: 'perl6;Perl6;Actions;term:sym<dotty>'
pc 212684 (src/gen/perl6-actions.pir:0)␤»
<diakopter> grammar bug
* masak submits
<diakopter> well, actions