+SKIP: {
+ skip("These tests use perlio", 5) unless $Config{useperlio};
+ my $w;
+ use warnings 'layer';
+ local $SIG{__WARN__} = sub { $w = shift };
+
+ eval { open(F, ">>>", $afile) };
+ like($w, qr/Invalid separator character '>' in PerlIO layer spec/,
+ "bad open (>>>) warning");
+ like($@, qr/Unknown open\(\) mode '>>>'/,
+ "bad open (>>>) failure");
+
+ eval { open(F, ">:u", $afile ) };
+ like($w, qr/Unknown PerlIO layer "u"/,
+ 'bad layer ">:u" warning');
+ eval { open(F, "<:u", $afile ) };
+ like($w, qr/Unknown PerlIO layer "u"/,
+ 'bad layer "<:u" warning');
+ eval { open(F, ":c", $afile ) };
+ like($@, qr/Unknown open\(\) mode ':c'/,
+ 'bad layer ":c" failure');
+}
+
+# [perl #28986] "open m" crashes Perl
+
+fresh_perl_like('open m', qr/^Search pattern not terminated at/,
+ { stderr => 1 }, 'open m test');
+
+fresh_perl_is(
+ 'sub f { open(my $fh, "xxx"); $fh = "f"; } f; f;print "ok"',
+ 'ok', { stderr => 1 },
+ '#29102: Crash on assignment to lexical filehandle');
+
+# [perl #31767] Using $1 as a filehandle via open $1, "file" doesn't raise
+# an exception
+
+eval { open $99, "foo" };
+like($@, qr/Modification of a read-only value attempted/, "readonly fh");
+
+# [perl#73626] mg_get wasn't run on the pipe arg
+
+{
+ package p73626;
+ sub TIESCALAR { bless {} }
+ sub FETCH { "$Perl -e 1"}
+
+ tie my $p, 'p73626';
+
+ package main;
+
+ ok( open(my $f, '-|', $p), 'open -| magic');
+}
+
+# [perl #77492] Crash when stringifying a glob, a reference to which has
+# been opened and written to.
+fresh_perl_is(
+ '
+ open my $fh, ">", \*STDOUT;
+ print $fh "hello";
+ "".*STDOUT;
+ print "ok";
+ close $fh;
+ unlink \*STDOUT;
+ ',
+ 'ok', { stderr => 1 },
+ '[perl #77492]: open $fh, ">", \*glob causes SEGV');
+
+# [perl #77684] Opening a reference to a glob copy.
+SKIP: {
+ skip_if_miniperl("no dynamic loading on miniperl, so can't load PerlIO::scalar", 1);
+ my $var = *STDOUT;
+ open my $fh, ">", \$var;
+ print $fh "hello";
+ is $var, "hello", '[perl #77684]: open $fh, ">", \$glob_copy'
+ # when this fails, it leaves an extra file:
+ or unlink \*STDOUT;
+}
+
+# check that we can call methods on filehandles auto-magically
+# and have IO::File loaded for us
+SKIP: {
+ skip_if_miniperl("no dynamic loading on miniperl, so can't load IO::File", 3);
+ is( $INC{'IO/File.pm'}, undef, "IO::File not loaded" );
+ my $var = "";
+ open my $fh, ">", \$var;
+ ok( eval { $fh->autoflush(1); 1 }, '$fh->autoflush(1) lives' );
+ ok( $INC{'IO/File.pm'}, "IO::File now loaded" );
+}