Allow `break` from a block called by `mrb_yield`; close #3359

This means #3701 is now OK to merge.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/gc.c b/src/gc.c
index 781059d13..f74a7f31d 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -112,6 +112,7 @@ typedef struct {
     struct RProc proc;
     struct REnv env;
     struct RException exc;
+    struct RBreak brk;
 #ifdef MRB_WORD_BOXING
     struct RFloat floatv;
     struct RCptr cptr;