Fix SMT Checker crash due to missing type information

libsolidity/analysis/TypeChecker.cpp

@@ -448,6 +448,9 @@ bool TypeChecker::visit(VariableDeclaration const& _variable)
 	)
 		m_errorReporter.typeError(_variable.location(), "Variables cannot be declared in interfaces.");
 
+	if (_variable.typeName())
+		_variable.typeName()->accept(*this);
+
 	// type is filled either by ReferencesResolver directly from the type name or by
 	// TypeChecker at the VariableDeclarationStatement level.
 	TypePointer varType = _variable.annotation().type;