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lrhn avatar lrhn commented on June 29, 2024

The problem here is that parsing comes (way) before type inference.

Asking whether e has a nullable type before deciding how to parse a following ?.x:y, assuming we allow .x as an expression, is going to complicate the compiler, because it needs to keep those tokens unparsed, or as a superposition of the two different parsings, until very late in the compilation.

And if the type inference of e depends on the context, then whether e is even in that context depends on how the following tokens are parsed.

The more likely approach would be to pick a default and require parentheses for the other option. (And the default is likely to be the one that parses today, so existing code won't change meaning.)

Or just insist that ?. is a single token, so e1? .x : y can't be a null-aware access.

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nate-thegrate avatar nate-thegrate commented on June 29, 2024

The problem here is that parsing comes (way) before type inference.

Thanks for letting me know! I've updated the proposal to account for this information.

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nate-thegrate avatar nate-thegrate commented on June 29, 2024

The main intent of this issue was to facilitate progress toward solving issue #3616, in which there's currently a link to a fleshed-out design proposal. I'm good with closing this and deferring to those. :)

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