> On Mar 29, 2017, at 4:21 PM, Brent Royal-Gordon via swift-evolution
> <swift-evolution@swift.org> wrote:
>
>> On Mar 29, 2017, at 4:14 PM, Brent Royal-Gordon <br...@architechies.com>
>> wrote:
>>
>>> On Mar 29, 2017, at 8:11 AM, John McCall via swift-evolution
>>> <swift-evolution@swift.org> wrote:
>>>
>>> I was suggesting that it would be a useful addition to the language, not
>>> that it
>>> necessarily needed new compiler support.
>>
>> Personally, what I'd like to see is for the existing <#whatever#>
>> placeholder syntax to be treated as an unimplemented() call. That probably
>> *would* require compiler support, although fortunately we already parse this
>> syntax into an EditorPlaceholderExpr.
>
> Actually, looking more closely, we already have this behavior in playgrounds
> (and REPLs); it's only an error when you compile. Like, we literally do this:
>
> // Found it. Flag it as error (or warning, if in playground mode) for
> the
> // rest of the compiler pipeline and lex it as an identifier.
> if (LangOpts.Playground) {
> diagnose(TokStart, diag::lex_editor_placeholder_in_playground);
> } else {
> diagnose(TokStart, diag::lex_editor_placeholder);
> }
>
> Could we change the compile-time error into a warning? Would that require an
> evolution proposal?
Ah, you beat me to it. I would support reducing this to a warning.
-Joe
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