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Until recently the .NET garbage collector used to be a single 30,000+ line C++ file. And it was maintained by one person if I remember correctly.

Amazed and horrified at the same time.

Just checked it and I underestimated. Just before the split it was at 54k LOC: <https://github.com/dotnet/runtime/blob/b96f3cc738f7fca9474fb...>

I’ve also read that a first version of the file came from a Common Lisp to C++ code generation step: <https://news.ycombinator.com/item?id=23295041>