Go Compiler Enables Generics by Default – Understanding the New -G=3 Flag
A recent Go repository commit sets the compiler's -G flag default to 3, activating the new types2 type‑checker and built‑in generics support while still allowing the old checker via -G=0, marking a significant shift in Go's language capabilities.
Go project code repository recently showed a PR that sets the default value of the -G flag in cmd/compile to 3.
This change enables the new types2 type checker and adds support for type parameters, effectively turning on generics by default. The older type checker remains usable by specifying -gcflags=all=-G=0.
The update also revises regression testing tools to account for the changed default behavior, such as known modifications in the types2 checker.
Note that the -G=0 mode is still experimental.
Developers had already noticed that generic code was merged when Go 1.17 was released last week.
Related discussion on Hacker News: https://news.ycombinator.com/item?id=28253692
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