Test readonliness of overload constants

including one to-do test

1 files changed, 15 insertions, 1 deletions

diff --git a/lib/overload.t b/lib/overload.t
index 74adae340e..aa99cc298b 100644
--- a/lib/overload.t
+++ b/lib/overload.t
@@ -48,7 +48,7 @@ package main;
 
 $| = 1;
 BEGIN { require './test.pl' }
-plan tests => 5191;
+plan tests => 5193;
 
 use Scalar::Util qw(tainted);
 
@@ -1293,6 +1293,20 @@ foreach my $op (qw(<=> == != < <= > >=)) {
 }
 
 {
+    # Check readonliness of constants, whether shared hash key
+    # scalars or no (brought up in bug #109744)
+    BEGIN { overload::constant integer => sub { "main" }; }
+    eval { ${\5} = 'whatever' };
+    like $@, qr/^Modification of a read-only value attempted at /,
+	'constant overloading makes read-only constants';
+    BEGIN { overload::constant integer => sub { __PACKAGE__ }; }
+    eval { ${\5} = 'whatever' };
+    local $::TODO = ' ';
+    like $@, qr/^Modification of a read-only value attempted at /,
+	'... even with shared hash key scalars';
+}
+
+{
     package Sklorsh;
     use overload
 	bool     => sub { shift->is_cool };