[ruby/json] raise_parse_error: avoid UB

Fix: https://github.com/ruby/json/pull/625

Declaring the buffer in a sub block cause bugs on some compilers.

https://github.com/ruby/json/commit/90967c9eb0

1 files changed, 9 insertions, 0 deletions

diff --git a/test/json/json_parser_test.rb b/test/json/json_parser_test.rb
index e4300e94fd..8d3c0c17c5 100644
--- a/test/json/json_parser_test.rb
+++ b/test/json/json_parser_test.rb
@@ -514,6 +514,15 @@ EOT
     assert_operator 60, :>, error.message.bytesize
   end
 
+  def test_parse_error_incomplete_hash
+    error = assert_raise(JSON::ParserError) do
+      JSON.parse('{"input":{"firstName":"Bob","lastName":"Mob","email":"[email protected]"}')
+    end
+    if RUBY_ENGINE == "ruby" && defined?(JSON::Ext)
+      assert_equal %(unexpected token at '{"input":{"firstName":"Bob","las'), error.message
+    end
+  end
+
   private
 
   def string_deduplication_available?