Add Moose package

CPAN/Moose/Exception/AttributeConflictInSummation.pm

@@ -0,0 +1,28 @@
+package Moose::Exception::AttributeConflictInSummation;
+our $VERSION = '2.2207';
+
+use Moose;
+extends 'Moose::Exception';
+with 'Moose::Exception::Role::Role', 'Moose::Exception::Role::AttributeName';
+
+has 'second_role_name' => (
+    is         => 'ro',
+    isa        => 'Str',
+    required   => 1,
+);
+
+sub _build_message {
+    my $self = shift;
+
+    my $role1     = $self->role_name;
+    my $role2     = $self->second_role_name;
+    my $attr_name = $self->attribute_name;
+
+    return "We have encountered an attribute conflict with '$attr_name'"
+           . " during role composition. "
+           . " This attribute is defined in both $role1 and $role2."
+           . " This is a fatal error and cannot be disambiguated.";
+}
+
+__PACKAGE__->meta->make_immutable;
+1;