is this allowed: `withContext(<http://Dispatchers.IO|Dispatchers.IO> + NonCancellable)`

# coroutines

[myanmarking]

is this allowed: withContext(<http://Dispatchers.IO|Dispatchers.IO> + NonCancellable)

[Sam]

BUT I think there is a gotcha: if you are changing dispatcher, withContext itself is cancellable and may throw CancellationException before entering the non-cancellable block

[Sam]

Can anyone else confirm whether that's correct?

[Sam]

I'm basing this on my understanding of the docs at https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines/with-context.html

[simon.vergauwen]

That is not correct. It gets checked on the new context which is NonCancelable.
https://github.com/Kotlin/kotlinx.coroutines/blob/d737da6f109784b67977af579fe3274c250857c9/kotlinx-coroutines-core/common/src/Builders.common.kt#L154

[Sam]

Thanks Simon! After reading the code that you linked to and testing out some examples, I agree with you.