revert vivication changes for now again0.13

1 files changed, 13 insertions, 38 deletions

diff --git a/lib/Package/Stash.pm b/lib/Package/Stash.pm
index 6c361c1..32e5d30 100644
--- a/lib/Package/Stash.pm
+++ b/lib/Package/Stash.pm
@@ -5,10 +5,6 @@ use warnings;
 
 use Carp qw(confess);
 use Scalar::Util qw(reftype);
-use Symbol;
-# before 5.12, assigning to the ISA glob would make it lose its magical ->isa
-# powers
-use constant BROKEN_ISA_ASSIGNMENT => ($] < 5.012);
 
 =head1 SYNOPSIS
 
@@ -234,42 +230,21 @@ sub get_package_symbol {
     my $namespace = $self->namespace;
 
     if (!exists $namespace->{$name}) {
-        if ($opts{vivify}) {
-            if ($type eq 'ARRAY') {
-                if (BROKEN_ISA_ASSIGNMENT) {
-                    $self->add_package_symbol(
-                        $variable,
-                        $name eq 'ISA' ? () : ([])
-                    );
-                }
-                else {
-                    $self->add_package_symbol($variable, []);
-                }
-            }
-            elsif ($type eq 'HASH') {
-                $self->add_package_symbol($variable, {});
-            }
-            elsif ($type eq 'SCALAR') {
-                $self->add_package_symbol($variable);
-            }
-            elsif ($type eq 'IO') {
-                $self->add_package_symbol($variable, Symbol::geniosym);
-            }
-            elsif ($type eq 'CODE') {
-                confess "Don't know how to vivify CODE variables";
-            }
-            else {
-                confess "Unknown type $type in vivication";
-            }
+        # assigning to the result of this function like
+        #   @{$stash->get_package_symbol('@ISA')} = @new_ISA
+        # makes the result not visible until the variable is explicitly
+        # accessed... in the case of @ISA, this might never happen
+        # for instance, assigning like that and then calling $obj->isa
+        # will fail. see t/005-isa.t
+        if ($opts{vivify} && $type eq 'ARRAY' && $name ne 'ISA') {
+            $self->add_package_symbol($variable, []);
+        }
+        elsif ($opts{vivify} && $type eq 'HASH') {
+            $self->add_package_symbol($variable, {});
         }
         else {
-            if ($type eq 'CODE') {
-                # this effectively "de-vivifies" the code slot. if we don't do
-                # this, referencing the coderef at the end of this function
-                # will cause perl to auto-vivify a stub coderef in the slot,
-                # which isn't what we want
-                $self->add_package_symbol($variable);
-            }
+            # FIXME
+            $self->add_package_symbol($variable)
         }
     }