useful and detailed errors for default checker in attrib generation

diff --git a/Changes b/Changes
index 1e08e65..6c62557 100644 (file)
--- a/Changes
+++ b/Changes
@@ -1,3 +1,5 @@
+  - useful and detailed errors for default checker in attrib generation
+
 0.091011 - 2012-06-27
   - re-add #web-simple as development IRC
   - don't assume Scalar::Util is imported into the current package

diff --git a/lib/Method/Generate/Accessor.pm b/lib/Method/Generate/Accessor.pm
index 88e38a3..1268a9e 100644 (file)
--- a/lib/Method/Generate/Accessor.pm
+++ b/lib/Method/Generate/Accessor.pm
@@ -5,6 +5,7 @@ use Moo::_Utils;
 use base qw(Moo::Object);
 use Sub::Quote;
 use B 'perlstring';
+use Scalar::Util 'blessed';
 BEGIN {
   our $CAN_HAZ_XS =
     !$ENV{MOO_XS_DISABLE}
@@ -45,9 +46,12 @@ sub generate_method {
   }
   if (exists $spec->{default}) {
     my $default = $spec->{default};
-    # default can be either a coderef or an overloaded object
-    die "Invalid default $default" unless ref $default
-      and ( ref $default eq 'CODE' or eval { \&$default } );
+    my $invalid = "Invalid default '" . overload::StrVal($default)
+      . "' for $into->$name - not a coderef";
+    die "$invalid or code-convertible object"
+      unless ref $default and (ref $default eq 'CODE' or blessed($default));
+    die "$invalid and could not be converted to a coderef: $@"
+      if !eval { \&$default };
   }
 
   my %methods;

diff --git a/lib/Moo.pm b/lib/Moo.pm
index 76ed286..3e256e2 100644 (file)
--- a/lib/Moo.pm
+++ b/lib/Moo.pm
@@ -706,6 +706,8 @@ doy - Jesse Luehrs (cpan:DOY) <doy at tozt dot net>
 
 perigrin - Chris Prather (cpan:PERIGRIN) <chris@prather.org>
 
+Mithaldu - Christian Walde (cpan:MITHALDU) <walde.christian@googlemail.com>
+
 =head1 COPYRIGHT
 
 Copyright (c) 2010-2011 the Moo L</AUTHOR> and L</CONTRIBUTORS>

diff --git a/t/method-generate-accessor.t b/t/method-generate-accessor.t
index 7043a4b..f66acfb 100644 (file)
--- a/t/method-generate-accessor.t
+++ b/t/method-generate-accessor.t
@@ -35,6 +35,11 @@ like(
   qr/Invalid default/, 'default - arrayref rejected'
 );
 
+like(
+  exception { $gen->generate_method('Foo' => 'five' => { is => 'ro', default => Foo->new }) },
+  qr/Invalid default/, 'default - non-code-convertible object rejected'
+);
+
 is(
   exception { $gen->generate_method('Foo' => 'six' => { is => 'ro', default => sub { 5 } }) },
   undef, 'default - coderef accepted'