2 files changed, 7 insertions, 0 deletions
diff --git a/libsolidity/interface/Exceptions.h b/libsolidity/interface/Exceptions.h
index 07835320..c651548a 100644
--- a/libsolidity/interface/Exceptions.h
+++ b/libsolidity/interface/Exceptions.h
@@ -37,6 +37,7 @@ using ErrorList = std::vector<std::shared_ptr<Error const>>;
 struct CompilerError: virtual Exception {};
 struct InternalCompilerError: virtual Exception {};
 struct FatalError: virtual Exception {};
+struct UnimplementedFeatureError: virtual Exception{};
 
 class Error: virtual public Exception
 {
diff --git a/libsolidity/interface/Utils.h b/libsolidity/interface/Utils.h
index 738669ac..eef8c917 100644
--- a/libsolidity/interface/Utils.h
+++ b/libsolidity/interface/Utils.h
@@ -30,6 +30,7 @@ namespace dev
 namespace solidity
 {
 struct InternalCompilerError;
+struct UnimplementedFeatureError;
 }
 }
 
@@ -37,3 +38,8 @@ struct InternalCompilerError;
 #define solAssert(CONDITION, DESCRIPTION) \
 	assertThrow(CONDITION, ::dev::solidity::InternalCompilerError, DESCRIPTION)
 
+#define solUnimplementedAssert(CONDITION, DESCRIPTION) \
+	assertThrow(CONDITION, ::dev::solidity::UnimplementedFeatureError, DESCRIPTION)
+
+#define solUnimplemented(DESCRIPTION) \
+	solUnimplementedAssert(false, DESCRIPTION)