Add error globals to mark list so they don't move

JSON gem is referencing constants defined in Ruby then keeping a
reference as a global.  We need to register these globals so they stay
pinned.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67483 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 0 deletions

diff --git a/ext/json/generator/generator.c b/ext/json/generator/generator.c
index 6b3cdd7e58..e59a120008 100644
--- a/ext/json/generator/generator.c
+++ b/ext/json/generator/generator.c
@@ -1344,6 +1344,8 @@ void Init_generator(void)
 
     eGeneratorError = rb_path2class("JSON::GeneratorError");
     eNestingError = rb_path2class("JSON::NestingError");
+    rb_gc_register_mark_object(eGeneratorError);
+    rb_gc_register_mark_object(eNestingError);
 
     cState = rb_define_class_under(mGenerator, "State", rb_cObject);
     rb_define_alloc_func(cState, cState_s_allocate);