1 files changed, 31 insertions, 0 deletions
diff --git a/lib/Reaction/Role/Meta/Class.pm b/lib/Reaction/Role/Meta/Class.pm
index 6d91e3f..3e3841c 100644
--- a/lib/Reaction/Role/Meta/Class.pm
+++ b/lib/Reaction/Role/Meta/Class.pm
@@ -9,4 +9,35 @@ around initialize => sub {
     $super->($class, $pkg, 'attribute_metaclass' => 'Reaction::Meta::Attribute', @_ );
 };
 
+around add_role => sub {
+    my $orig = shift;
+    my $self = shift;
+    my ($role) = @_;
+
+    my @roles = grep { !$_->isa('Moose::Meta::Role::Composite') }
+                     $role->calculate_all_roles;
+    my @bad_roles = map { Moose::Util::does_role($_, 'MooseX::Role::Parameterized::Meta::Trait::Parameterized') ? $_->genitor->name : $_->name }
+                    grep { $_->get_attribute_list > 0 }
+                    grep { !Moose::Util::does_role($_->applied_attribute_metaclass, 'Reaction::Role::Meta::Attribute') }
+                    @roles;
+
+    if (@bad_roles) {
+        my $plural = @bad_roles > 1;
+        warn "You are applying the role" . ($plural ? "s " : " ")
+           . join(", ", @bad_roles)
+           . " to the Reaction::Class " . $self->name
+           . ", but " . ($plural ? "these roles do" : "that role does")
+           . " not use Reaction::Role or"
+           . " Reaction::Role::Parameterized. In Moose versions greater than"
+           . " 2.0, this will cause the special behavior of Reaction"
+           . " attributes to no longer be applied to attributes defined"
+           . " in " . ($plural ? "these roles" : "this role")
+           . ". You should replace 'use Moose::Role' with"
+           . " 'use Reaction::Role' or 'use MooseX::Role::Parameterized' with"
+           . " 'use Reaction::Role::Parameterized'.";
+    }
+
+    $self->$orig(@_);
+} if Moose->VERSION >= 1.9900;
+
 1;