> On Jun 25, 2016, at 1:19 PM, Sean Alling via swift-dev <swift-dev@swift.org>
> wrote:
>
> Hi everyone,
>
> I’m suggesting a change to the compiler that returns an error when an object
> 'does not conform to protocol’ to nest sub-errors that’ll list what
> properties and methods the object hasn’t implemented.
>
> I’m using the idea of a nested error so that the exceptions thrown will be
> grouped when shown. That was each doesn’t create a new error, racking up the
> error count, but rather just showing the developer the things he/she needs to
> implement.
I would *love* for us to have errors with Fix-Its that put in stub declarations
for what you need to implement to conform to the protocol. I don’t think you
should use sub-errors, though, because the structure doesn’t always come across
well in IDEs. Rather, I’d suggest emitting one error per missing requirement,
with a Fix-It that adds the proper declaration into the type/extension that
declared conformance, and a note pointing to the requirement itself.
- Doug
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