evalable6

query

class A {};constant B=class :: is A[] {};

result

(exit code 1) 
===SORRY!=== Error while compiling /tmp/DL04gpvPQ2
Cannot resolve caller trait_mod:<is>(<anon|94655243299008>, A, Array); none of these signatures match:
    (Mu:U $child, Mu:U $parent)
    (Mu:U $child, :$DEPRECATED!)
    (Mu:U $type, :$rw!)
    (Mu:U $type, :$nativesize!)
    (Mu:U $type, :$ctype!)
    (Mu:U $type, :$unsigned!)
    (Mu:U $type, :$hidden!)
    (Mu:U $type, Mu :$array_type!)
    (Mu:U $type, *%fail)
    (Attribute:D $attr, |c is raw)
    (Attribute:D $attr, :$rw!)
    (Attribute:D $attr, :$readonly!)
    (Attribute $attr, :$required!)
    (Attribute $attr, Mu :$default!)
    (Attribute:D $attr, :$box_target!)
    (Attribute:D $attr, :$DEPRECATED!)
    (Attribute:D $attr, :$leading_docs!)
    (Attribute:D $attr, :$trailing_docs!)
    (Routine:D $r, |c is raw)
    (Routine:D $r, :$rw!)
    (Routine:D $r, :$raw!)
    (Routine:D $r, :$default!)
    (Routine:D $r, :$DEPRECATED!)
    (Routine:D $r, Mu :$inlinable!)
    (Routine:D $r, :$onlystar!)
    (Routine:D $r, :prec(%spec)!)
    (Routine $r, :&equiv!)
    (Routine $r, :&tighter!)
    (Routine $r, :&looser!)
    (Routine $r, :$assoc!)
    (Parameter:D $param, |c is raw)
    (Parameter:D $param, :$readonly!)
    (Parameter:D $param, :$rw!)
    (Parameter:D $param, :$copy!)
    (Parameter:D $param, :$required!)
    (Parameter:D $param, :$raw!)
    (Parameter:D $param, :$onearg!)
    (Parameter:D $param, :$leading_docs!)
    (Parameter:D $param, :$trailing_docs!)
    (Routine:D \r, :$export!, :$SYMBOL = { ... })
    (Mu:U \type, :$export!)
    (Mu \sym, :$export!, :$SYMBOL!)
    (Block:D $r, :$leading_docs!)
    (Block:D $r, :$trailing_docs!)
    (Routine:D $r, :$leading_docs!)
    (Routine:D $r, :$trailing_docs!)
    (Mu:U $docee, :$leading_docs!)
    (Mu:U $docee, :$trailing_docs!)
    (Routine:D $r, :$hidden-from-backtrace!)
    (Routine:D $r, :$hidden-from-USAGE!)
    (Routine:D $r, :$pure!)
    (Routine:D $r, :$nodal!)
    (Variable:D $v, |c is raw)
    (Variable:D $v, Mu :$default!)
    (Variable:D $v, :$dynamic!)
    (Variable:D $v, :$export!)
    (Routine $r, Str :$equiv!)
    (Routine $r, Str :$tighter!)
    (Routine $r, Str :$looser!)
at /tmp/DL04gpvPQ2:1