Assert that union sizes match

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67078 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 0 deletions

diff --git a/gc.c b/gc.c
index 9f6dd75400..2b00eb8c4e 100644
--- a/gc.c
+++ b/gc.c
@@ -449,6 +449,8 @@ typedef struct RVALUE {
 #pragma pack(pop)
 #endif
 
+STATIC_ASSERT(rvalue_size, sizeof(((RVALUE*)0)->as) == sizeof(((RVALUE*)0)->as.values));
+
 typedef uintptr_t bits_t;
 enum {
     BITS_SIZE = sizeof(bits_t),