Fix careless handling of the hinthash in PP mode (RT#73402)

diff --git a/Changes b/Changes
index e3a6849..8352a79 100644 (file)
--- a/Changes
+++ b/Changes
@@ -1,3 +1,4 @@
+        - More robust handling of the tied %^H in pure perl mode (RT#73402)
         - Limit the debugger workarounds to perls between 5.8.8 and 5.14,
           extend debugger support to all perl versions (FC) (RT#69862)
         - If possible, automatically install (but not load) the debugger

diff --git a/lib/namespace/clean.pm b/lib/namespace/clean.pm
index fbcfeec..1e6d51a 100644 (file)
--- a/lib/namespace/clean.pm
+++ b/lib/namespace/clean.pm
@@ -80,7 +80,10 @@ EOE
       push @$stack, namespace::clean::_ScopeGuard->arm(shift);
     }
     else {
+      my %old_contents = %^H;
+      %^H = ();
       tie( %^H, 'namespace::clean::_TieHintHash', namespace::clean::_ScopeGuard->arm(shift) );
+      $^H{$_} = $old_contents{$_} for keys %old_contents;
     }
   }
 

diff --git a/t/09-fiddle-hinthash.t b/t/09-fiddle-hinthash.t
new file mode 100644 (file)
index 0000000..adc1923
--- /dev/null
+++ b/t/09-fiddle-hinthash.t
@@ -0,0 +1,48 @@
+use strict;
+use warnings;
+
+use Test::More 0.88;
+
+{
+  package Bar;
+  use sort 'stable';
+  use namespace::clean;
+  use sort 'stable';
+  {
+    1;
+  }
+
+  Test::More::pass('no segfault');
+}
+
+{
+  package Foo;
+  BEGIN {
+    $^H{'foo'} = 'bar';
+  }
+
+  use namespace::clean;
+
+  BEGIN {
+    Test::More::is( $^H{'foo'}, 'bar', 'hinthash intact' );
+  }
+
+  {
+    1;
+  }
+
+  BEGIN {
+    SKIP: {
+      Test::More::skip(
+        'Tied hinthash values not present in extended caller() on perls older than 5.10'
+       .', regardless of mode (PP or XS)',
+        1
+      ) if ($] < 5.010_000);
+      package DB;
+      Test::More::is( ( (caller(0))[10] || {} )->{foo}, 'bar', 'hinthash values visible in caller' );
+    }
+  }
+}
+
+
+done_testing;