Add JSON.pm to third_party

third_party/JSON/JSON-2.59/t/xe20_croak_message.t

Index: third_party/JSON/JSON-2.59/t/xe20_croak_message.t
diff --git a/third_party/JSON/JSON-2.59/t/xe20_croak_message.t b/third_party/JSON/JSON-2.59/t/xe20_croak_message.t
new file mode 100644
index 0000000000000000000000000000000000000000..1af44dd0dc7dc07054c26694e54da5b7792adb5f
--- /dev/null
+++ b/third_party/JSON/JSON-2.59/t/xe20_croak_message.t
@@ -0,0 +1,21 @@
+
+# https://rt.cpan.org/Public/Bug/Display.html?id=61708
+
+use strict;
+use Test::More;
+
+BEGIN { plan tests => 1 };
+BEGIN { $ENV{PERL_JSON_BACKEND} = 1; }
+
+use JSON; # currently it can't pass with -support_by_pp;
+
+
+SKIP: {
+    skip "can't use JSON::XS.", 1, unless( JSON->backend->is_xs );
+
+    my $json = JSON->new;
+
+    eval q{ $json->encode( undef ) };
+    like( $@, qr/line 1\./ );
+}
+