Fix my @A = 1, 2, 3; @A>>++; say @A;

We need to make unary hyper operators eager. Otherwise code with side effects
(like increment or decrement operators) may never actually execute if the
resulting List is not further processed.

Thanks to moritz++ for golfing this bug!

src/core/metaops.pm

@@ -555,7 +555,7 @@ multi sub deepmap(\op, \obj) {
         }
     }.new(op, iterable.iterator);
 
-    nqp::iscont(obj) ?? List.from-iterator(result).item !! List.from-iterator(result)
+    nqp::iscont(obj) ?? List.from-iterator(result).eager.item !! List.from-iterator(result).eager
 }
 
 multi sub deepmap(\op, Associative \h) {