X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FMouse%2FUtil%2FTypeConstraints.pm;h=f4d3c649e9d441a8d63a40b7fb34c9b071eaeea6;hb=d58887328353bfd216406ff7d686b5a4877d1731;hp=68ade3df6b3898260594c9df9a1f0979a4781672;hpb=ca980dc4f492df68e6536c0c83a2d520adc43066;p=gitmo%2FMouse.git

diff --git a/lib/Mouse/Util/TypeConstraints.pm b/lib/Mouse/Util/TypeConstraints.pm
index 68ade3d..f4d3c64 100644
--- a/lib/Mouse/Util/TypeConstraints.pm
+++ b/lib/Mouse/Util/TypeConstraints.pm
@@ -17,6 +17,7 @@ Mouse::Exporter->setup_import_methods(
         coerce
 
         find_type_constraint
+        register_type_constraint
     )],
 );
 
@@ -149,9 +150,18 @@ sub _create_type{
 
         if($TYPE{$name}){
             my $that = $TYPE{$name}->{package_defined_in} || __PACKAGE__;
-            ($this eq $that) or Carp::croak(
-                "The type constraint '$name' has already been created in $that and cannot be created again in $this"
-            );
+            if($this ne $that) {
+                my $note = '';
+                if($that eq __PACKAGE__) {
+                    $note = sprintf " ('%s' is %s type constraint)",
+                        $name,
+                        scalar(grep { $name eq $_ } list_all_builtin_type_constraints())
+                            ? 'a builtin'
+                            : 'an implicitly created';
+                }
+                Carp::croak("The type constraint '$name' has already been created in $that"
+                          . " and cannot be created again in $this" . $note);
+            }
         }
     }
     else{
@@ -367,6 +377,16 @@ sub find_type_constraint {
     return $TYPE{$spec};
 }
 
+sub register_type_constraint {
+    my($constraint) = @_;
+    Carp::croak("No type supplied / type is not a valid type constraint")
+        unless Mouse::Util::is_a_type_constraint($constraint);
+    my $name = $constraint->name;
+    Carp::croak("can't register an unnamed type constraint")
+        unless defined $name;
+    return $TYPE{$name} = $constraint;
+}
+
 sub find_or_parse_type_constraint {
     my($spec) = @_;
     return $spec if Mouse::Util::is_a_type_constraint($spec);
@@ -406,7 +426,7 @@ Mouse::Util::TypeConstraints - Type constraint system for Mouse
 
 =head1 VERSION
 
-This document describes Mouse version 0.55
+This document describes Mouse version 0.68
 
 =head2 SYNOPSIS