From 794dc9df98d2aaf2f143f32ac7dfa42fa46ce07e Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Tue, 2 Aug 2011 01:10:22 -0500
Subject: compile each thing in a separate package, to avoid leakage

---
 lib/Eval/Closure.pm   | 18 +++++++++++-------
 t/compiling-package.t | 29 +++++++++++++++++++++++------
 2 files changed, 34 insertions(+), 13 deletions(-)

diff --git a/lib/Eval/Closure.pm b/lib/Eval/Closure.pm
index 23cf250..42c20da 100644
--- a/lib/Eval/Closure.pm
+++ b/lib/Eval/Closure.pm
@@ -207,14 +207,18 @@ sub _clean_eval_closure {
     }
 }
 
+$Eval::Closure::SANDBOX_ID = 0;
+
 sub _clean_eval {
-    package # hide from PAUSE
-        Eval::Closure::Sandbox;
-    local $@;
-    local $SIG{__DIE__};
-    my $compiler = eval $_[0];
-    my $e = $@;
-    return [ $compiler, $e ];
+    $Eval::Closure::SANDBOX_ID++;
+    return eval <<EVAL;
+package Eval::Closure::Sandbox_$Eval::Closure::SANDBOX_ID;
+local \$@;
+local \$SIG{__DIE__};
+my \$compiler = eval \$_[0];
+my \$e = \$@;
+[ \$compiler, \$e ];
+EVAL
 }
 
 sub _make_compiler_source {
diff --git a/t/compiling-package.t b/t/compiling-package.t
index 5c3764f..09b4d0b 100644
--- a/t/compiling-package.t
+++ b/t/compiling-package.t
@@ -5,13 +5,30 @@ use Test::More;
 
 use Eval::Closure;
 
-my $code = eval_closure(
-    source => 'no strict "refs"; sub { keys %{__PACKAGE__ . "::"} }',
-);
+{
+    my $code = eval_closure(
+        source => 'no strict "refs"; sub { keys %{__PACKAGE__ . "::"} }',
+    );
 
-# defining the sub { } creates __ANON__, calling 'no strict' creates BEGIN
-my @stash_keys = grep { $_ ne '__ANON__' && $_ ne 'BEGIN' } $code->();
+    # defining the sub { } creates __ANON__, calling 'no strict' creates BEGIN
+    my @stash_keys = grep { $_ ne '__ANON__' && $_ ne 'BEGIN' } $code->();
 
-is_deeply([@stash_keys], [], "compiled in an empty package");
+    is_deeply([@stash_keys], [], "compiled in an empty package");
+}
+
+{
+    # the more common case where you'd run into this is imported subs
+    # for instance, Bread::Board::as vs Moose::Util::TypeConstraints::as
+    my $c1 = eval_closure(
+        source => 'no strict "vars"; sub { ++$foo }',
+    );
+    my $c2 = eval_closure(
+        source => 'no strict "vars"; sub { --$foo }',
+    );
+    is($c1->(), 1);
+    is($c1->(), 2);
+    is($c2->(), -1);
+    is($c2->(), -2);
+}
 
 done_testing;
-- 
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