'What does "intrinsic" implementation mean in Kotlin?

When browsing through Kotlin source code, I found that in some places NotImplementedError is thrown:

public suspend inline val coroutineContext: CoroutineContext
    get() {
        throw NotImplementedError("Implemented as intrinsic")
    }

public suspend inline fun <T> suspendCoroutineUninterceptedOrReturn(crossinline block: (Continuation<T>) -> Any?): T {
    contract { callsInPlace(block, InvocationKind.EXACTLY_ONCE) }
    throw NotImplementedError("Implementation of suspendCoroutineUninterceptedOrReturn is intrinsic")
}

I assume these are not real not-implemented errors since otherwise code cannot run.

My questions are:

what does "intrinsic" mean here and why NotImplementedError is thrown?
where could I view the source code for these implementation?

kotlin kotlin-coroutines

Solution 1:^[1]

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'What does "intrinsic" implementation mean in Kotlin?

Solution 1:[1]

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Solution 1:^[1]