package Moose::Exception::CallingReadOnlyMethodOnAnImmutableInstance; our $VERSION = '2.2011'; use Moose; extends 'Moose::Exception'; has 'method_name' => ( is => 'ro', isa => 'Str', required => 1 ); sub _build_message { my $self = shift; "The '".$self->method_name."' method is read-only when called on an immutable instance"; } __PACKAGE__->meta->make_immutable; 1;