Error due to binding to a slice
class X::Bind::Slice is Exception {}
When you try to bind to an array or hash slice:
my @a; @a[0, 1] := [42];
CATCH { default { put .^name, ': ', .Str } };
# OUTPUT: «X::Bind::Slice: Cannot bind to Array slice»
and
my %h; %h<a b> := {};
CATCH { default { put .^name, ': ', .Str } };
# OUTPUT: «X::Bind::Slice: Cannot bind to Hash slice»
you get an exception of type ::Bind::Slice.
method type(X::Bind::Slice:D:)
returns the type object of the thing that you tried to slice-bind, for example Array, List or Hash.