lib/Moo/HandleMoose.pm: Fix for rt#84615

If the constructor autovivification call returns 'undef', then the
package we're trying to get the contructor for, ( and from that, the
    constructor specs ), that package was not constructed via

  package;
  use Moo;

doesn't turn up in %Moo::MAKERS, and must either be either Moose::Object itself, or a simple child class of
that.

Therefore, assume it has no attributes, and inflate a minimal
methods-only metaclass.

diff --git a/Changes b/Changes
index b5c9bc9..493cc83 100644 (file)
--- a/Changes
+++ b/Changes
@@ -1,3 +1,4 @@
+  - successfully inflate a metaclass for attributeless classes (RT#86415)
   - fix false default values used with non-lazy accessors
   - stop built values that fail isa checks still getting stored in the object
   - stop lazy+weak_ref accessors re-building their value on every call

diff --git a/lib/Moo/HandleMoose.pm b/lib/Moo/HandleMoose.pm
index 8b19839..3bcb725 100644 (file)
--- a/lib/Moo/HandleMoose.pm
+++ b/lib/Moo/HandleMoose.pm
@@ -65,11 +65,14 @@ sub inject_real_metaclass_for {
        { @attr_info },
        [ @attr_info[grep !($_ % 2), 0..$#attr_info] ]
       )
-    } else {
-      my $specs = Moo->_constructor_maker_for($name)->all_attribute_specs;
+    } elsif ( my $cmaker = Moo->_constructor_maker_for($name) ) {
+      my $specs = $cmaker->all_attribute_specs;
       (0, Moose::Meta::Class->initialize($name), $specs,
        [ sort { $specs->{$a}{index} <=> $specs->{$b}{index} } keys %$specs ]
       );
+    } else {
+       # This codepath is used if $name does not exist in $Moo::MAKERS
+       (0, Moose::Meta::Class->initialize($name), {}, [] )
     }
   };