CompositionLocalProvider related RuntimeError: illegal cast about compose-multiplatform HOT 7 CLOSED

Yes, the fix was implemented a bit a later than 2.0.20-Beta1.

2.0.20-Beta2 should have it.

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A workaround is here #5045 (comment) (my problem was with Surface Material 3)

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Hi @bnorm! Thanks for reporting!

Indeed, 1.7.0-dev and alpha (and all furter builds) won't work in web with kotlin 2.0.0, because the compose compiler for web for 2.0.0 doesn't support a new API added in compose runtime 1.7.0

For now, you can use kotlin:

• 2.0.10-RC-515 with the default compiler plugin
• or 1.9.24 with compose compiler 1.5.14.1-beta02

The fix can't be backported to 2.0.0, it will be available only in kotlin 2.0.10.

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Ha, I was about to create an issue like this one !
I confirm that this is happening in compose 1.7.0-alpha01. Because I had about the same stacktrace and it was fixed only by downgrading to compose 1.6.11 !!!
In my case the CompositionLocalProvider that crashed was something related to Surface from Material3, also tried to downgrade to Surface from Material i.e. Material 2.

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I'm closing this one as I see no particular actions on our side, except suggesting to use a correct Kotlin version.
Feel free to add more questions or reopen if needed.

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I can confirm that version 2.0.10-RC-515 does indeed my issue. Thanks!

I did test this with 2.0.20-Beta1 and the issue was present there. I'm guessing the issue will be fixed in the next 2.0.20 release as well?

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Please check the following ticket on YouTrack for follow-ups to this issue. GitHub issues will be closed in the coming weeks.

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