Move/rewrite test for Recursive call to Perl_load_module

This test was relying on a bug in require that causes it to use what-
ever I/O layers are active in require‘s *caller* when opening a file
[perl #96008].

This rewrites the test using the example in ticket #75722.
Since it no longer has anything to do with open.pm, it is now in
t/lib/warnings/perlio.

diff --git a/lib/open.t b/lib/open.t
index 2f2a04a..3a5565d 100644 (file)
--- a/lib/open.t
+++ b/lib/open.t
@@ -7,7 +7,7 @@ BEGIN {
        require './test.pl';
 }
 
-plan 24;
+plan 23;
 
 # open::import expects 'open' as its first argument, but it clashes with open()
 sub import {
@@ -186,13 +186,6 @@ SKIP: {
 
     eval q[use Encode::Alias;use open ":std", ":locale"];
     is($@, '', 'can use :std and :locale');
-
-    use open IN => ':non-existent';
-    eval {
-       require Symbol; # Anything that exists but we havn't loaded
-    };
-    like($@, qr/Can't locate Symbol|Recursive call/i,
-        "test for an endless loop in PerlIO_find_layer");
 }
 
 {

diff --git a/t/lib/warnings/perlio b/t/lib/warnings/perlio
index 0ccc5a8..a53bece 100644 (file)
--- a/t/lib/warnings/perlio
+++ b/t/lib/warnings/perlio
@@ -24,6 +24,17 @@ Unknown PerlIO layer \"%.*s\"
 
 __END__
 
+# perlio [PerlIO_find_layer]
+unshift @INC, sub {
+    return undef unless caller eq "main";
+    open my $fh, "<", \1;
+    $fh;
+};
+require Symbol; # doesn't matter whether it exists or no
+EXPECT
+Recursive call to Perl_load_module in PerlIO_find_layer at -e line 2.
+########
+
 # perlio [PerlIO_parse_layers]
 no warnings 'layer';
 open(F, ">:-aa", "bb");