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-rw-r--r--include/mruby/proc.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/mruby/proc.h b/include/mruby/proc.h
index 39f5eca22..82b93ddef 100644
--- a/include/mruby/proc.h
+++ b/include/mruby/proc.h
@@ -37,7 +37,7 @@ struct RProc {
/* aspec access */
#define MRB_ASPEC_REQ(a) (((a) >> 18) & 0x1f)
#define MRB_ASPEC_OPT(a) (((a) >> 13) & 0x1f)
-#define MRB_ASPEC_REST(a) ((a) & (1<<12))
+#define MRB_ASPEC_REST(a) (((a) >> 12) & 0x1)
#define MRB_ASPEC_POST(a) (((a) >> 7) & 0x1f)
#define MRB_ASPEC_KEY(a) (((a) >> 2) & 0x1f)
#define MRB_ASPEC_KDICT(a) ((a) & (1<<1))