[swift-evolution] Code comments that check code validity.

Amir Michail a.michail at me.com
Sat Jan 14 17:35:33 CST 2017

> On Jan 14, 2017, at 6:28 PM, Xiaodi Wu <xiaodi.wu at gmail.com> wrote:
> This has been brought up on this list before. The conclusion of the previous thread on this topic was that there is a way to do this:
> #if false
> // put your code here
> #endif

This would not check the code for compilability within the surrounding code. This requires more than a syntax check.

> It does not allow you to comment out fragments of a single statement, but the incremental value of devoting time to additionally support that is, it would seem, low.
> On Sat, Jan 14, 2017 at 17:18 Amir Michail via swift-evolution <swift-evolution at swift.org> wrote:
> The code in a “code comment" must compile (not just be syntactically correct) yet must not have any effect on the resulting executable.
> For example, commented entries in an array would be checked for compilability but would not be included in the executable.
> Such “code comments" would allow you to have code/data that is currently unused but is constantly checked to be valid just in case you want to use it in the future.
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