about toolchain directive in go.mod?

[xie cui]

go.mod:
module toolchain_test

go 1.22.3

toolchain go1.25.0

main.go:

package main

func main() {
   println("Hello World!")
}

when run go build, I think that should try to download toolchain 1.25.0 which do not exist. So I expect that cmd should failed. But It run sucess.

[王旭东]

Hi,

Please refer to the Go toolchain selection section. go command consults the GOTOOLCHAIN env before making a decision.

Thanks,

Xudong