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-rw-r--r--include/mruby/proc.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/mruby/proc.h b/include/mruby/proc.h
index e72e8f7e4..870e9f748 100644
--- a/include/mruby/proc.h
+++ b/include/mruby/proc.h
@@ -22,6 +22,7 @@ struct REnv {
#define MRB_ENV_STACK_LEN(e) ((e)->flags)
#define MRB_ENV_UNSHARE_STACK(e) ((e)->cioff = -1)
+#define MRB_ENV_STACK_SHARED_P(e) ((e)->cioff >= 0)
struct RProc {
MRB_OBJECT_HEADER;