Backwards compatibility test

Author: ndkoval

kotlinx-coroutines-core/common/src/selects/Select.kt

@@ -50,15 +50,16 @@ import kotlin.native.concurrent.*
  * Use [yield] or [CoroutineScope.isActive] to periodically check for cancellation in tight loops if needed.
  */
 public suspend inline fun <R> select(crossinline builder: SelectBuilder<R>.() -> Unit): R {
-    contract {
-        callsInPlace(builder, InvocationKind.EXACTLY_ONCE)
-    }
-    return SelectImplementation<R>(coroutineContext).run {
-        builder(this)
-        // TAIL-CALL OPTIMIZATION: the only
-        // suspend call is at the last position.
-        doSelect()
-    }
+    return selectOld(builder)
+//    contract {
+//        callsInPlace(builder, InvocationKind.EXACTLY_ONCE)
+//    }
+//    return SelectImplementation<R>(coroutineContext).run {
+//        builder(this)
+//        // TAIL-CALL OPTIMIZATION: the only
+//        // suspend call is at the last position.
+//        doSelect()
+//    }
 }
 
 /**

kotlinx-coroutines-core/common/src/selects/SelectOld.kt

@@ -73,7 +73,7 @@ internal class UnbiasedSelectBuilderImpl<R>(
 }
 
 // This is the old version of `select`. It should work to guarantee binary compatibility.
-internal suspend inline fun <R> selectOld(crossinline builder: SelectBuilder<R>.() -> Unit): R {
+public suspend inline fun <R> selectOld(crossinline builder: SelectBuilder<R>.() -> Unit): R {
     return suspendCoroutineUninterceptedOrReturn { uCont ->
         val scope = SelectBuilderImpl(uCont)
         try {
@@ -86,7 +86,7 @@ internal suspend inline fun <R> selectOld(crossinline builder: SelectBuilder<R>.
 }
 
 // This is the old version of `selectUnbiased`. It should work to guarantee binary compatibility.
-internal suspend inline fun <R> selectUnbiasedOld(crossinline builder: SelectBuilder<R>.() -> Unit): R =
+public suspend inline fun <R> selectUnbiasedOld(crossinline builder: SelectBuilder<R>.() -> Unit): R =
     suspendCoroutineUninterceptedOrReturn { uCont ->
         val scope = UnbiasedSelectBuilderImpl(uCont)
         try {

kotlinx-coroutines-core/common/src/selects/SelectUnbiased.kt

@@ -19,13 +19,14 @@ import kotlin.coroutines.*
  * See [select] function description for all the other details.
  */
 public suspend inline fun <R> selectUnbiased(crossinline builder: SelectBuilder<R>.() -> Unit): R {
-    contract {
-        callsInPlace(builder, InvocationKind.EXACTLY_ONCE)
-    }
-    return UnbiasedSelectImplementation<R>(coroutineContext).run {
-        builder(this)
-        doSelect()
-    }
+    return selectUnbiasedOld(builder)
+//    contract {
+//        callsInPlace(builder, InvocationKind.EXACTLY_ONCE)
+//    }
+//    return UnbiasedSelectImplementation<R>(coroutineContext).run {
+//        builder(this)
+//        doSelect()
+//    }
 }
 
 /**