2 files changed, 12 insertions, 1 deletions
diff --git a/libsolidity/ast/Types.cpp b/libsolidity/ast/Types.cpp
index 5630743b..28f7e1b7 100644
--- a/libsolidity/ast/Types.cpp
+++ b/libsolidity/ast/Types.cpp
@@ -26,6 +26,7 @@
 #include <libdevcore/CommonIO.h>
 #include <libdevcore/CommonData.h>
 #include <libdevcore/SHA3.h>
+#include <libdevcore/UTF8.h>
 #include <libsolidity/interface/Utils.h>
 #include <libsolidity/ast/AST.h>
 
@@ -852,6 +853,16 @@ bool StringLiteralType::operator==(const Type& _other) const
 	return m_value == dynamic_cast<StringLiteralType const&>(_other).m_value;
 }
 
+std::string StringLiteralType::toString(bool) const
+{
+	size_t invalidSequence;
+
+	if (!dev::validate(m_value, invalidSequence))
+		return "literal_string (contains invalid UTF-8 sequence at position " + dev::toString(invalidSequence) + ")";
+
+	return "literal_string \"" + m_value + "\"";
+}
+
 TypePointer StringLiteralType::mobileType() const
 {
 	return make_shared<ArrayType>(DataLocation::Memory, true);
diff --git a/libsolidity/ast/Types.h b/libsolidity/ast/Types.h
index 1ee762e5..1282e5d8 100644
--- a/libsolidity/ast/Types.h
+++ b/libsolidity/ast/Types.h
@@ -419,7 +419,7 @@ public:
 	virtual bool canLiveOutsideStorage() const override { return false; }
 	virtual unsigned sizeOnStack() const override { return 0; }
 
-	virtual std::string toString(bool) const override { return "literal_string \"" + m_value + "\""; }
+	virtual std::string toString(bool) const override;
 	virtual TypePointer mobileType() const override;
 
 	std::string const& value() const { return m_value; }