Dispatchers IO is now considered non-blocking context

See BlockingMethodInNonBlockingContextInspection

idea/testData/inspections/blockingCallsDetection/ContextCheck.kt

@@ -2,7 +2,6 @@
 
 import kotlin.coroutines.*
 import org.jetbrains.annotations.BlockingContext
-import kotlin.coroutines.experimental.buildSequence
 import java.lang.Thread.sleep
 
 suspend fun testFunction() {

idea/testData/inspections/blockingCallsDetection/DispatchersTypeCheck.kt

@@ -0,0 +1,28 @@
+@file:Suppress("UNUSED_PARAMETER")
+package kotlinx.coroutines
+
+import java.lang.Thread.sleep
+
+suspend fun withIoDispatcher() {
+    withContext(Dispatchers.IO) {
+        //no warning since IO dispatcher type used
+        Thread.sleep(42)
+    }
+
+    withContext(Dispatchers.Default) {
+        Thread.<warning descr="Inappropriate blocking method call">sleep</warning>(1)
+    }
+}
+
+class CoroutineDispatcher()
+object Dispatchers {
+    val IO: kotlinx.coroutines.CoroutineDispatcher = TODO()
+    val Default: kotlinx.coroutines.CoroutineDispatcher = TODO()
+}
+
+suspend fun <T> withContext(
+    context: CoroutineDispatcher,
+    f: suspend () -> T
+) {
+    TODO()
+}