Go 1.19 Release Candidate Highlights and New Features
The Go 1.19 release candidate introduces generic bug fixes, an updated memory model aligned with C, C++, Java, JavaScript, Rust and Swift, higher default file descriptor limits, a v3 thread‑sanitizer race detector, a new "unix" build tag, LoongArch‑64 support, and a jump‑table‑based switch implementation that improves performance by roughly 20%.
Go 1.19 has released its first release candidate, with the final version expected in August.
Main Changes
Bug fixes related to generics.
Memory model updated to match those used by C, C++, Java, JavaScript, Rust, and Swift.
Default limit for open files increased at startup.
Race detector upgraded to version 3 of the thread sanitizer.
Added a new "unix" build tag.
Official support for the 64‑bit LoongArch (loong64) CPU architecture on Linux (GOOS=linux, GOARCH=loong64).
The Go compiler now implements large integer and string switch statements using a jump table, yielding an average performance gain of about 20%.
For more details see the Go 1.19 Release Notes and the Go 1.19 Beta1 documentation.
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