Moose-2.1405HEADMoose-2.1405master

1 files changed, 25 insertions, 0 deletions

diff --git a/lib/Moose/Exception/MetaclassIsARoleNotASubclassOfGivenMetaclass.pm b/lib/Moose/Exception/MetaclassIsARoleNotASubclassOfGivenMetaclass.pm
new file mode 100644
index 0000000..b6dec64
--- /dev/null
+++ b/lib/Moose/Exception/MetaclassIsARoleNotASubclassOfGivenMetaclass.pm
@@ -0,0 +1,25 @@
+package Moose::Exception::MetaclassIsARoleNotASubclassOfGivenMetaclass;
+our $VERSION = '2.1405';
+
+use Moose;
+extends 'Moose::Exception';
+with 'Moose::Exception::Role::Role';
+
+use Moose::Util 'find_meta';
+
+has 'metaclass' => (
+    is       => 'ro',
+    isa      => 'Str',
+    required => 1
+);
+
+sub _build_message {
+    my $self = shift;
+    my $role_name = $self->role_name;
+    my $role      = find_meta( $role_name );
+    my $metaclass = $self->metaclass;
+    return "$role_name already has a metaclass, but it does not inherit $metaclass ($role). "
+        ."You cannot make the same thing a role and a class. Remove either Moose or Moose::Role.";
+}
+
+1;