1 files changed, 40 insertions, 0 deletions
diff --git a/lib/Moose/Exception/InvalidArgPassedToMooseUtilMetaRole.pm b/lib/Moose/Exception/InvalidArgPassedToMooseUtilMetaRole.pm
new file mode 100644
index 0000000..2910e7a
--- /dev/null
+++ b/lib/Moose/Exception/InvalidArgPassedToMooseUtilMetaRole.pm
@@ -0,0 +1,40 @@
+package Moose::Exception::InvalidArgPassedToMooseUtilMetaRole;
+our $VERSION = '2.1405';
+
+use Moose;
+extends 'Moose::Exception';
+
+has 'argument' => (
+    is       => 'ro',
+    isa      => 'Any',
+    required => 1
+);
+
+sub _build_message {
+    my $self = shift;
+    my $error = 'When using Moose::Util::MetaRole, you must pass a Moose class name,'
+        . ' role name, metaclass object, or metarole object.';
+
+    my $arg = $self->argument;
+    my $found = blessed $arg ? $arg : Class::MOP::class_of($arg);
+
+    my $error2;
+
+    if ( defined $found && blessed $found ) {
+        $error2 = " You passed ".$arg.", and we resolved this to a "
+            . ( blessed $found )
+            . ' object.';
+    }
+    elsif ( !defined $found ) {
+        $error2 = " You passed ".( defined $arg ? $arg : "undef" ).", and this did not resolve to a metaclass or metarole."
+            . ' Maybe you need to call Moose->init_meta to initialize the metaclass first?';
+    }
+    else {
+        $error2 = " You passed an undef."
+            . ' Maybe you need to call Moose->init_meta to initialize the metaclass first?';
+    }
+
+    $error.$error2;
+}
+
+1;