Add Moose package

CPAN/Moose/Exception/CannotAssignValueToReadOnlyAccessor.pm

@@ -0,0 +1,20 @@
+package Moose::Exception::CannotAssignValueToReadOnlyAccessor;
+our $VERSION = '2.2207';
+
+use Moose;
+extends 'Moose::Exception';
+with 'Moose::Exception::Role::Class', 'Moose::Exception::Role::EitherAttributeOrAttributeName';
+
+has 'value' => (
+    is       => 'ro',
+    isa      => 'Any',
+    required => 1
+);
+
+sub _build_message {
+    my $self = shift;
+    "Cannot assign a value to a read-only accessor";
+}
+
+__PACKAGE__->meta->make_immutable;
+1;