Fix a segfault during optree construction. (bug #27024)

p4raw-id: //depot/perl@22371

1 files changed, 9 insertions, 1 deletions

diff --git a/t/comp/parser.t b/t/comp/parser.t
index e59fec6622..2c25807021 100644
--- a/t/comp/parser.t
+++ b/t/comp/parser.t
@@ -9,7 +9,7 @@ BEGIN {
 }
 
 require "./test.pl";
-plan( tests => 43 );
+plan( tests => 44 );
 
 eval '%@x=0;';
 like( $@, qr/^Can't modify hash dereference in repeat \(x\)/, '%@x=0' );
@@ -147,3 +147,11 @@ EOF
     eval q{ sub f { @a=@b=@c;  {use} } };
     like( $@, qr/syntax error/, "use without body" );
 }
+
+# Bug #27024
+{
+    # this used to segfault (because $[=1 is optimized away to a null block)
+    my $x;
+    $[ = 1 while $x;
+    pass();
+}