From 1d9087245c7659b765d594466394aacf5bd3ef59 Mon Sep 17 00:00:00 2001
From: Andreas Rumpf <rumpf_a@web.de>
Date: Thu, 25 Jan 2018 16:02:13 +0100
Subject: [PATCH] JS codegen bugfix: don't crash on wrong importcpp patterns

---
 compiler/jsgen.nim | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/compiler/jsgen.nim b/compiler/jsgen.nim
index ac1a4b5d50..d58008516f 100644
--- a/compiler/jsgen.nim
+++ b/compiler/jsgen.nim
@@ -1344,6 +1344,9 @@ proc genArgs(p: PProc, n: PNode, r: var TCompRes; start=1) =
 
 proc genOtherArg(p: PProc; n: PNode; i: int; typ: PType;
                  generated: var int; r: var TCompRes) =
+  if i >= n.len:
+    globalError(n.info, "wrong importcpp pattern; expected parameter at position " & $i &
+        " but got only: " & $(n.len-1))
   let it = n[i]
   var paramType: PNode = nil
   if i < sonsLen(typ):