From 69ff61d149b6952b3ba149d35b66bac960234360 Mon Sep 17 00:00:00 2001
From: Alex Beregszaszi <alex@rtfs.hu>
Date: Fri, 21 Sep 2018 14:25:05 +0100
Subject: [PATCH] Add assertion for annotated type in
 Structtype::canBeUsedExternally

---
 libsolidity/ast/Types.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libsolidity/ast/Types.cpp b/libsolidity/ast/Types.cpp
index 25702f194..36dcbfe69 100644
--- a/libsolidity/ast/Types.cpp
+++ b/libsolidity/ast/Types.cpp
@@ -2126,8 +2126,11 @@ bool StructType::canBeUsedExternally(bool _inLibrary) const
 		// passed by value and thus the encoding does not differ, but it will disallow
 		// mappings.
 		for (auto const& var: m_struct.members())
+		{
+			solAssert(var->annotation().type, "");
 			if (!var->annotation().type->canBeUsedExternally(false))
 				return false;
+		}
 	}
 	return true;
 }