[perl #77114] Rakudo parses my %foo XX= 1 but STD does not

[Christian Bartolomaeus via RT]

Since said PR was merged recently and the tests in roast are unfudged, I'm 
closing this ticket.

$ perl6 -e 'my %foo XX= 1;'
===SORRY!=== Error while compiling -e
Cannot cross with = because list assignment operators are too fiddly
at -e:1
------> my %foo XX=⏏ 1;