5.10 is somewhat unhappy with alter_superclass

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While testing out RT 3.8 on 5.10, we ran into a mysterious segfault.  
We eventually tracked it down to this: In 5.10, if you replace an  
entry in @INC things sometimes appear to fall apart.
Mason uses this pattern in HTML::Mason::Request::alter_superclass.

Working on a copy of the list and replacing it later makes RT start  
passing tests again.


--- /old/HTML/Mason/Request.pm	2008-02-20 13:10:13.000000000 -0500
+++ /new/HTML/Mason/Request.pm	2008-06-01 19:02:03.000000000 -0400
@@ -351,7 +351,8 @@
      my $isa_ref;
      {
          no strict 'refs';
-        $isa_ref = \@{"$class\::ISA"};
+        my @entries = @{$class."::ISA"};
+        $isa_ref = \@entries;
      }

      # handles multiple inheritance properly and preserve
@@ -365,13 +366,16 @@
              if ( $old_super ne $new_super )
              {
                  $isa_ref->[$x] = $new_super;
-
-                $class->valid_params( %{ $class->valid_params } );
              }
-
              last;
          }
+    }
+
+    {
+        no strict 'refs';
+        @{$class."::ISA"} = @$isa_ref;
      }
+    $class->valid_params( %{ $class->valid_params } );
  }

  sub exec {
sh-3.2#


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