[perl #64494] Multiple constraints shouldn't be allowed before a variable in Rakudo

[Carl Mäsak]

# New Ticket Created by  "Carl Mäsak" 
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<masak> rakudo: role Foo {}; role Bar {}; sub baz(Foo Bar $a) {}; say
"should not be alive here before 6.0.0"
<p6eval> rakudo 0310a3: OUTPUT«should not be alive here before 6.0.0␤»
* masak submits rakudobug

According to <http://perlcabal.org/syn/S12.html#Multiple_constraints>,
v6.0.0 will only allow a single type constraint before a variable.