make the error line up with the one used in core

2 files changed, 30 insertions, 4 deletions

diff --git a/lib/smartmatch/engine/core.pm b/lib/smartmatch/engine/core.pm
index ee3c81e..410c983 100644
--- a/lib/smartmatch/engine/core.pm
+++ b/lib/smartmatch/engine/core.pm
@@ -4,6 +4,7 @@ use warnings;
 use 5.010;
 
 use B;
+use Carp qw(croak);
 use Hash::Util::FieldHash qw(idhash);
 use Scalar::Util qw(blessed looks_like_number reftype);
 use overload ();
@@ -62,12 +63,11 @@ sub match {
         # see http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2011-07/msg00214.html
         if (!$overload && overload::Overloaded($b)) {
             $overload = overload::Method($a, '~~');
-            die "no ~~ overloading on $b"
-                unless $overload;
-            return $a->$overload($b, 0);
+            return $a->$overload($b, 0)
+                if $overload;
         }
 
-        die "no ~~ overloading on $b"
+        croak("Smart matching a non-overloaded object breaks encapsulation")
             unless $overload;
         return $b->$overload($a, 1);
     }
diff --git a/t/error.t b/t/error.t
new file mode 100644
index 0000000..10d69be
--- /dev/null
+++ b/t/error.t
@@ -0,0 +1,26 @@
+#!/usr/bin/env perl
+use strict;
+use warnings;
+use Test::More;
+
+my $foo = bless {};
+my $bar = bless {};
+
+eval '$foo ~~ $bar';
+my $core_error = $@;
+$core_error =~ s/\d+/XXX/g;
+(my $short_core_error = $core_error) =~ s/ at .* line .*//;
+
+{
+    use smartmatch 'core';
+    eval '$foo ~~ $bar';
+    my $engine_error = $@;
+    $engine_error =~ s/\d+/XXX/g;
+    (my $short_engine_error = $engine_error) =~ s/ at .* line .*//;
+    is($short_engine_error, $short_core_error);
+    { local $TODO = "Carp is dumb";
+    is($engine_error, $core_error);
+    }
+}
+
+done_testing;