From @moritz

07​:45 < moritz_> rakudo​: my %h; push %h<a>, 1, 2; say %h.perl
07​:45 <+p6eval> rakudo 19931f​: OUTPUT«Method '!fill' not found for
invocant of class ''␤ in 'List​::push' at line 2610​:CORE.setting␤ in
main program body at line 22​:/tmp/IxHzXM4aK0␤»

From @Timbus

The issue isn't with hashes, it's with the Any that is returned when you
access a key that doesn't exist.
Any doesn't implement .push or !fill, and the global push sub is
actually List.push, which obviously expects a List. Pmichaud suggested
the fix​:
<pmichaud> Any implements .push.
<pmichaud> but you have to check for definedness, too.
<pmichaud> If defined, then nextsame.

This patch seems to comply. And if push is meant to vivify an Array
instead of a List, it can be easily changed.

From @Timbus

diff --git a/src/core/Any-list.pm b/src/core/Any-list.pm
index f61784e..6e4175f 100644
--- a/src/core/Any-list.pm
+++ b/src/core/Any-list.pm
@@ -26,6 +26,11 @@ augment class Any {
         ~pir::join__SsP($separator, self.flat.eager);
     }
 
+    our multi method push (*@items) is export {
+        if self //= List.new() { nextsame }
+        else { self.push(@items) }
+    }
+
     multi method elems() {
         1;
     }
diff --git a/src/core/List.pm b/src/core/List.pm
index ea699d7..a8753a4 100644
--- a/src/core/List.pm
+++ b/src/core/List.pm
@@ -80,7 +80,7 @@ augment class List does Positional {
                   !! fail('Undefined value popped from empty array');
     }
 
-    our method push(*@values) is export {
+    our method push(*@values) {
         self!fill(0);
         pir::push(@!rest, @values.Seq.eager.iterator );
         self;

The RT System itself - Status changed from 'new' to 'open'

From @masak

<mfollett> rakudo​: my %hash; push(%hash<books>, 'Cooking for Geeks');
<p6eval> rakudo d75c61​: OUTPUT«Method '!fill' not found for invocant
of class '' [...]
* masak submits rakudobug
<mfollett> Anyone know what I'm doing wrong there?
<masak> mfollett​: looks good to me.
<mfollett> masak​: ok, good, I thought I was crazy
<masak> mfollett​: as a general rule, you're not. :)

From @coke

No change in the past year.

--
Will "Coke" Coleda

From @moritz

fixed now, and tested in S02-types/autovivification.t

@moritz - Status changed from 'open' to 'resolved'