py: Fix break from within a for loop.

Needed to pop the iterator object when breaking out of a for loop.  Need
also to be careful to unwind exception handler before popping iterator.

Addresses issue #635.

1 files changed, 2 insertions, 0 deletions

diff --git a/py/emit.h b/py/emit.h
index 5a3b27d83..874ec8819 100644
--- a/py/emit.h
+++ b/py/emit.h
@@ -44,6 +44,8 @@ typedef enum {
 #define MP_EMIT_STAR_FLAG_SINGLE (0x01)
 #define MP_EMIT_STAR_FLAG_DOUBLE (0x02)
 
+#define MP_EMIT_BREAK_FROM_FOR (0x8000)
+
 typedef struct _emit_t emit_t;
 
 typedef struct _emit_method_table_t {