[perl #65096] Cannot loop over a list of arrays with a junction or arrays in their midst in Rakudo

[Carl Mäsak]

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<moritz_> rakudo: for [1], [2]|[3], [4] -> @a { say @a.elems }
<p6eval> rakudo 9a5305: OUTPUT«1␤Non-Positional argument or Positional
of wrong element type for @a in call to _block34 [...]
<moritz_> bug?
<moritz_> don't know about junctions and arrays...
* masak submits, just in case

If the new standard is to not autothread in for loops, then this is in
fact in order. One might possibly want a more explanatory error
message, though, since the contents of the junction actually match the
signature.