On Tue, 9 Jul 2019 02:26:03 -0700 (PDT)
Nicolas Grilly <nico...@vocationcity.com> wrote:
> try is just syntactic sugar for `if err != nil { return ..., err }` and
> nothing more.
Unfortunately it is NOT.
It (`try`) does magical things to the return parameters, ie. it elides
the last one but only if it is **not** in the scope of the upper level `try`
otherwise it morphs into the naked return. Hardly a "sugar".
> try doesn't change the language grammar and semantics at all:
> - error handling is still explicit;
Error handling becomes implicit and `try` demands special shape
off the surrounding code (named return parameters, decorating
must be done in a defer)
> - error are still values;
yes.
> - there is still no stack unwinding;
There is a defer must unless `try` is meant only for pushing the error upstack.
> - etc.
etc.
> The comparison with exceptions (and anonymous goto statements) is
> completely uncalled for.
If it was a pin to my proposal, in the https://github.com/golang/go/issues/32968
all labels are named and to be seen plain in all ast tools (eg. cover).
> I'm baffled by the amount of negative emotions, strong feelings and harsh
> reactions to the addition of a minor built-in function whose sole goal is
> to reduce verbosity by factoring out a repetitive pattern.
This is a stated goal. Harsh reactions stem from what experienced programmers
see as `unintended consequences`, namely unstoppable and widespread abuse of
`try`
(put into several level deep matrioshkas).
> So please fellow gophers, continue to tell the Go team what you'd want to
> be improved in the try proposal, but have a little faith in their work :-)
I still have.
--
Wojciech S. Czarnecki
<< ^oo^ >> OHIR-RIPE
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