From f2959795330966f13cb65bbb6034c88a01fc0bcc Mon Sep 17 00:00:00 2001
From: dcodeIO <dcode@dcode.io>
Date: Fri, 9 Jun 2017 10:14:11 +0200
Subject: [PATCH] Emit a maximum of one error var when generating verifiers,
 fixes #786

---
 src/verifier.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/verifier.js b/src/verifier.js
index 4d302ba02..b5ddc29ad 100644
--- a/src/verifier.js
+++ b/src/verifier.js
@@ -29,10 +29,13 @@ function genVerifyValue(gen, field, fieldIndex, ref) {
             gen
                     ("break")
             ("}");
-        } else gen
-            ("var e=types[%i].verify(%s);", fieldIndex, ref)
+        } else {
+            gen
+            ((gen.hasErrorVar ? "" : "var ") + "e=types[%i].verify(%s);", fieldIndex, ref)
             ("if(e)")
                 ("return%j+e", field.name + ".");
+            gen.hasErrorVar = true;
+        }
     } else {
         switch (field.type) {
             case "int32":