From 663a1d0cd56c933f6ce85c16924e161b5cb55a8a Mon Sep 17 00:00:00 2001
From: Andrew Kelley <superjoe30@gmail.com>
Date: Thu, 4 Feb 2016 17:43:57 -0700
Subject: [PATCH] switch trap in debug mode when no prong found

---
 src/codegen.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/codegen.cpp b/src/codegen.cpp
index 3d45413ec7..f4defb8405 100644
--- a/src/codegen.cpp
+++ b/src/codegen.cpp
@@ -2412,6 +2412,9 @@ static LLVMValueRef gen_switch_expr(CodeGen *g, AstNode *node) {
     if (!else_prong) {
         LLVMPositionBuilderAtEnd(g->builder, else_block);
         add_debug_source_node(g, node);
+        if (!g->is_release_build) {
+            LLVMBuildCall(g->builder, g->trap_fn_val, nullptr, 0, "");
+        }
         LLVMBuildUnreachable(g->builder);
     }