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Which one(s) are you thinking of? The JVM's appear to be in C++, GHC's and SBCL's are in C, Go's is in Go, and I'm not familiar with other high-performance garbage-collected platforms.

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Just to add one more data point, the .NET GC is also written in C++.

In C++ in one giant file: https://github.com/dotnet/runtime/blob/main/src/coreclr/gc/g...

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