Setting ptr %p > end+1 %p
Setting cnt to %d, ptr implies %d
+
+Invalid separator character %c%c%c in PerlIO layer specification %s
+
+ open(F, ">:-aa", "bb")
+
+
+Argument list not closed for PerlIO layer \"%.*s\""
+
+ open(F, ">:aa(", "bb")
+
+Unknown PerlIO layer \"%.*s\"
+
+ # PerlIO/xyz.pm has 1;
+ open(F, ">xyz", "bb")
+
__END__
+
+# perlio [PerlIO_parse_layers]
+no warnings 'layer';
+open(F, ">:-aa", "bb");
+use warnings 'layer';
+open(F, ">:-aa", "bb");
+close F;
+EXPECT
+Invalid separator character '-' in PerlIO layer specification -aa at - line 6.
+########
+
+# perlio [PerlIO_parse_layers]
+no warnings 'layer';
+open(F, ">:aa(", "bb");
+use warnings 'layer';
+open(F, ">:aa(", "bb");
+close F;
+EXPECT
+Argument list not closed for PerlIO layer "aa(" at - line 6.
+########
+
+--FILE-- PerlIO/xyz.pm
+1;
+--FILE--
+# perlio [PerlIO_parse_layers]
+no warnings 'layer';
+open(F, ">:xyz", "bb");
+use warnings 'layer';
+open(F, ">:xyz", "bb");
+close F;
+END { 1 while unlink "bb" } # KEEP THIS WITH THE LAST TEST.
+EXPECT
+Unknown PerlIO layer "xyz" at - line 5.