[clktmr]

As far as I understand, it's only about including more information in the compilers json output. But that information was already available in non-json output in previos Go versions.

To get explanations on the optimization decisions by the compiler build your package with:

    go build -gcflags="-m -m"

See also:

    go tool compile -h
    go doc cmd/compile

[kristianp]

Thanks.