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Singularity and Midori relied on GC for memory safety, and that was a huge problem for Longhorn/Vista because it was very difficult to write code that would work reliably when memory is critically low.

Rust is a completely different story. Sure, Rust's standard library treats OOM is fatal, which is the right thing for almost all application code, but it's not difficult to create Rust libraries that treat OOM as a recoverable error, or that don't allocate at all.

If the Singularity group had invented Rust instead of Sing# things might have turned out differently.

Yet according to MSR Midori had no issues powering a portion of Bing in production.

Multiple OSes have been written in GC enabled system languages.

Having a GC doesn't mean all memory is required to be GC allocated on the heap, usually the same mechanisms of a language like C++ are also available, e.g. Modula-3, System C#, D and so forth.

Joe Duffy clearly states in one of his Midori talks that WinDev did not believe in Midori, even with it running in front of them.

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