1 files changed, 12 insertions, 1 deletions
diff --git a/t/op/substr.t b/t/op/substr.t
index dfb483aee5..4df6426388 100755
--- a/t/op/substr.t
+++ b/t/op/substr.t
@@ -1,6 +1,6 @@
 #!./perl
 
-print "1..177\n";
+print "1..179\n";
 
 #P = start of string  Q = start of substr  R = end of substr  S = end of string
 
@@ -609,3 +609,14 @@ ok 174, $x eq "\x{100}\x{200}\xFFb";
     my $y = substr $x, 4;
     ok 177, substr($x, 7, 1) eq "7";
 }
+
+# [perl #24200] string corruption with lvalue sub
+
+{
+    my $foo = "a";
+    sub bar: lvalue { substr $foo, 0 }
+    bar = "XXX";
+    ok 178, bar eq 'XXX';
+    $foo = '123456789';
+    ok 179, bar eq '123456789';
+}