be a bit stricter and more consistent with tc messages

diff --git a/lib/Moose/Meta/TypeConstraint.pm b/lib/Moose/Meta/TypeConstraint.pm
index 6060726..f66888d 100644 (file)
--- a/lib/Moose/Meta/TypeConstraint.pm
+++ b/lib/Moose/Meta/TypeConstraint.pm
@@ -10,6 +10,7 @@ use overload '0+'     => sub { refaddr(shift) }, # id an object
              bool     => sub { 1 },
              fallback => 1;
 
+use Carp qw(confess);
 use Eval::Closure;
 use Scalar::Util qw(blessed refaddr);
 use Sub::Name qw(subname);
@@ -127,6 +128,11 @@ sub new {
         );
     }
 
+    if ( exists $args{message}
+      && (!ref($args{message}) || ref($args{message}) ne 'CODE') ) {
+        confess("The 'message' parameter must be a coderef");
+    }
+
     my $self  = $class->_new(%args);
     $self->compile_type_constraint()
         unless $self->_has_compiled_type_constraint;
@@ -234,7 +240,9 @@ sub assert_valid {
 
 sub get_message {
     my ($self, $value) = @_;
-    my $msg = $self->message || $self->_default_message;
+    my $msg = $self->has_message
+        ? $self->message
+        : $self->_default_message;
     local $_ = $value;
     return $msg->($value);
 }