If I remember correctly, EDG was the only C++ implementation that actually attempted to implement the export keyword for templates in old C++. It was this implementation experience that informed the deprecation of export. EDG is a major influence in the development of C++.
Prof. John Potter told me they were the only frontend that correctly implement multiple inheritance for c++98. He thought very highly of EDG... For old time c++ folks, he was a mod on comp.lang.c++.moderated and a very cool teacher. So I hope I remember his lessons correctly...
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