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-rw-r--r--vm_core.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/vm_core.h b/vm_core.h
index f09dd8237e..f25b74dcdd 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -997,6 +997,7 @@ typedef struct rb_thread_struct {
rb_execution_context_t *ec;
struct rb_thread_sched_item sched;
+ rb_atomic_t serial; // only for RUBY_DEBUG_LOG()
VALUE last_status; /* $? */