From a44cc14e1c0eadcd823b6e91c54948dcb273c174 Mon Sep 17 00:00:00 2001
From: h2so5 <mail@h2so5.net>
Date: Thu, 2 Jan 2014 18:23:26 +0900
Subject: Fix extended arena check in gc_protect

---
 src/gc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/gc.c b/src/gc.c
index 5592b48f1..5168eccf8 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -370,17 +370,19 @@ mrb_free_heap(mrb_state *mrb)
 static void
 gc_protect(mrb_state *mrb, struct RBasic *p)
 {
-  if (mrb->arena_idx >= MRB_GC_ARENA_SIZE) {
 #ifdef MRB_GC_FIXED_ARENA
+  if (mrb->arena_idx >= MRB_GC_ARENA_SIZE) {
     /* arena overflow error */
     mrb->arena_idx = MRB_GC_ARENA_SIZE - 4; /* force room in arena */
     mrb_raise(mrb, E_RUNTIME_ERROR, "arena overflow error");
+  }
 #else
+  if (mrb->arena_idx >= mrb->arena_capa) {
     /* extend arena */
     mrb->arena_capa *= 1.5;
     mrb->arena = (struct RBasic**)mrb_realloc(mrb, mrb->arena, sizeof(struct RBasic*)*mrb->arena_capa);
-#endif
   }
+#endif
   mrb->arena[mrb->arena_idx++] = p;
 }
 
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