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A comment on Go 1.19 Released. Parent comment

Re:Go 1.19 Released by eikenberry on Tuesday August 02, 2022 @04:30PM (#32323897)
It was too bad they had to do it. Being able to use say LLVM's compiler tech would have had it's advantages. But they wanted a good developer UX which LLVM just doesn't provide.
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Re:Go 1.19 Released by funny_falcon on Tuesday August 02, 2022 @04:46PM (#32324087)
And disadvantages. LLVM is still hard to build precise GC with.

Largest profit Go gains from custom toolset - they able to buld precise GC.

Then they were able to build reliable preemptible scheduler, which would be hard as well if they use LLVM/GCC.

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