From @zoffixznet

This code crashes with "Cannot unbox a type object (Any) to a str".

The problem goes away, if I change $^stuff to $_ or to $^stuff.List or to |$^stuff

  my $materials = bag flat 'wood' xx 300, 'glass' xx 100, 'brick' xx 3000;

  my @​wanted =
  bag(flat 'wood' xx 200, 'glass' xx 50, 'brick' xx 3000) but "house",
  bag(flat 'wood' xx 100, 'glass' xx 50) but "shed",
  bag( 'wood' xx 50) but "dog-house";

  say 'I can build...';
  .put for @​wanted.combinations.grep​: { $materials â�½ [â��] $^stuff };

From @zoffixznet

On Mon, 05 Dec 2016 12​:14​:05 -0800, cpan@​zoffix.com wrote​:

This code crashes with "Cannot unbox a type object (Any) to a str".

The problem goes away, if I change $^stuff to $_ or to $^stuff.List or
to |$^stuff

my $materials = bag flat 'wood' xx 300, 'glass' xx 100, 'brick' xx
3000;

my @​wanted =
bag(flat 'wood' xx 200, 'glass' xx 50, 'brick' xx 3000) but
"house",
bag(flat 'wood' xx 100, 'glass' xx 50) but
"shed",
bag( 'wood' xx 50) but "dog-
house";

say 'I can build...';
.put for @​wanted.combinations.grep​: { $materials â�½ [â��] $^stuff };

Golfed a bit more​:

[bag() but "house"].combinations.grep​: { [â��] $^stuff-we-want }

Any more thing I remove and the bug disappears.

From @zoffixznet

On Mon, 05 Dec 2016 12​:14​:05 -0800, cpan@​zoffix.com wrote​:

This code crashes with "Cannot unbox a type object (Any) to a str".

The problem goes away, if I change $^stuff to $_ or to $^stuff.List or
to |$^stuff

my $materials = bag flat 'wood' xx 300, 'glass' xx 100, 'brick' xx
3000;

my @​wanted =
bag(flat 'wood' xx 200, 'glass' xx 50, 'brick' xx 3000) but
"house",
bag(flat 'wood' xx 100, 'glass' xx 50) but
"shed",
bag( 'wood' xx 50) but "dog-
house";

say 'I can build...';
.put for @​wanted.combinations.grep​: { $materials â�½ [â��] $^stuff };

Thank you for the report. This is now fixed \o/

Fix​: rakudo/rakudo@9a161fa
Tests​: Raku/roast@ebfab26314

@zoffixznet - Status changed from 'new' to 'resolved'