It's documented. From lang spec
https://golang.org/ref/spec#Function_declarations
"A function declaration may omit the body. Such a declaration
provides the signature for a function implemented outside Go,
such as an assembly routine."
On Thu, 9 Feb 2017 04:15:00 -0800
(PST) Sina Siadat <sia...@gmail.com> wrote:
> Hi! In $GOROOT/src/sync/mutex.go:19 there is a function declaration
> like this:
>
> func throw(string) // provided by runtime
>
> The function body is missing. I was wondering what is meant by
> "provided by runtime" and how it is done.
> I am guessing this is the same as the throw func defined in
> src/runtime/panic.go:589. But can't find how the compiler connects
> the two. I thought maybe a body is assigned to this function later
> like this:
>
> throw = func(s string) { }
>
> But this fails to compile with "cannot assign to throw" probably
> because throw is not a variable.
>
> Thanks!
>
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