X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/5565990ae7d1a23693f78cbe611ec2a5af8dd5e1..042560a65fd56038b3116f30639cb99d98c48622:/lib/base.pm

diff --git a/lib/base.pm b/lib/base.pm
index fc0f7f9..be4c667 100644
--- a/lib/base.pm
+++ b/lib/base.pm
@@ -71,12 +71,13 @@ sub import {
     my $inheritor = caller(0);
     my @isa_classes;
 
+    my @bases;
     foreach my $base (@_) {
         if ( $inheritor eq $base ) {
             warn "Class '$inheritor' tried to inherit from itself\n";
         }
 
-        next if $inheritor->isa($base);
+        next if grep $_->isa($base), ($inheritor, @bases);
 
         if (has_version($base)) {
             ${$base.'::VERSION'} = '-1, set by base.pm' 
@@ -99,14 +100,14 @@ Base class package "$base" is empty.
     or make that module available in \@INC (\@INC contains: @INC).
 ERROR
                 }
-                $sigdie = $SIG{__DIE__};
+                $sigdie = $SIG{__DIE__} || undef;
             }
             # Make sure a global $SIG{__DIE__} makes it out of the localization.
             $SIG{__DIE__} = $sigdie if defined $sigdie;
             ${$base.'::VERSION'} = "-1, set by base.pm"
               unless defined ${$base.'::VERSION'};
         }
-        push @isa_classes, $base;
+        push @bases, $base;
 
         if ( has_fields($base) || has_attr($base) ) {
             # No multiple fields inheritance *suck*
@@ -121,6 +122,8 @@ ERROR
     # Save this until the end so it's all or nothing if the above loop croaks.
     push @{"$inheritor\::ISA"}, @isa_classes;
 
+    push @{"$inheritor\::ISA"}, @bases;
+
     if( defined $fields_base ) {
         inherit_fields($inheritor, $fields_base);
     }