Add callstack to model report

liblangutil/Exceptions.h

@@ -28,6 +28,7 @@
 #include <memory>
 #include <libdevcore/Exceptions.h>
 #include <libdevcore/Assertions.h>
+#include <libdevcore/CommonData.h>
 #include <liblangutil/SourceLocation.h>
 
 namespace langutil
@@ -108,6 +109,11 @@ public:
 		infos.emplace_back(_errMsg, _sourceLocation);
 		return *this;
 	}
+	SecondarySourceLocation& append(SecondarySourceLocation&& _other)
+	{
+		infos += std::move(_other.infos);
+		return *this;
+	}
 
 	/// Limits the number of secondary source locations to 32 and appends a notice to the
 	/// error message.