Remove non-nullable restriction from InputT, StateT, and RenderingT.

kotlin/workflow-core/src/main/java/com/squareup/workflow/RenderContext.kt

@@ -38,7 +38,7 @@ import com.squareup.workflow.WorkflowAction.Companion.noop
  *
  * See [renderChild].
  */
-interface RenderContext<StateT : Any, in OutputT : Any> {
+interface RenderContext<StateT, in OutputT : Any> {
 
   /**
    * Given a function that takes an [event][EventT] and can mutate the state or emit an output,

kotlin/workflow-core/src/main/java/com/squareup/workflow/StatefulWorkflow.kt

@@ -58,10 +58,10 @@ import kotlinx.coroutines.CoroutineScope
  * @see StatelessWorkflow
  */
 abstract class StatefulWorkflow<
-    in InputT : Any,
-    StateT : Any,
+    in InputT,
+    StateT,
     out OutputT : Any,
-    out RenderingT : Any
+    out RenderingT
     > : Workflow<InputT, OutputT, RenderingT> {
 
   /**

kotlin/workflow-core/src/main/java/com/squareup/workflow/StatelessWorkflow.kt

@@ -34,7 +34,7 @@ import com.squareup.workflow.WorkflowAction.Companion.emitOutput
  *
  * @see StatefulWorkflow
  */
-abstract class StatelessWorkflow<InputT : Any, OutputT : Any, RenderingT : Any> :
+abstract class StatelessWorkflow<InputT, OutputT : Any, RenderingT> :
     Workflow<InputT, OutputT, RenderingT> {
 
   private val statefulWorkflow = object : StatefulWorkflow<InputT, Unit, OutputT, RenderingT>() {

kotlin/workflow-core/src/main/java/com/squareup/workflow/Workflow.kt

@@ -74,7 +74,7 @@ package com.squareup.workflow
  * @see StatefulWorkflow
  * @see StatelessWorkflow
  */
-interface Workflow<in InputT : Any, out OutputT : Any, out RenderingT : Any> {
+interface Workflow<in InputT, out OutputT : Any, out RenderingT> {
 
   /**
    * Provides a [StatefulWorkflow] view of this workflow. Necessary because [StatefulWorkflow] is

kotlin/workflow-core/src/main/java/com/squareup/workflow/WorkflowAction.kt

@@ -19,7 +19,7 @@ package com.squareup.workflow
  * A function that can change the current state of a [Workflow] by returning a new one, and
  * also optionally emit an output.
  */
-interface WorkflowAction<StateT : Any, out OutputT : Any> : (StateT) -> Pair<StateT, OutputT?> {
+interface WorkflowAction<StateT, out OutputT : Any> : (StateT) -> Pair<StateT, OutputT?> {
 
   override operator fun invoke(state: StateT): Pair<StateT, OutputT?>
 

kotlin/workflow-runtime/src/main/java/com/squareup/workflow/WorkflowHost.kt

@@ -44,12 +44,12 @@ private val DEFAULT_WORKFLOW_COROUTINE_NAME = CoroutineName("WorkflowHost")
  *
  * Create these by injecting a [Factory] and calling [run][Factory.run].
  */
-interface WorkflowHost<in InputT : Any, out OutputT : Any, out RenderingT : Any> {
+interface WorkflowHost<in InputT, out OutputT : Any, out RenderingT> {
 
   /**
    * Output from a [WorkflowHost]. Emitted from [WorkflowHost.updates] after every render pass.
    */
-  data class Update<out OutputT : Any, out RenderingT : Any>(
+  data class Update<out OutputT : Any, out RenderingT>(
     val rendering: RenderingT,
     val snapshot: Snapshot,
     val output: OutputT? = null
@@ -82,7 +82,7 @@ interface WorkflowHost<in InputT : Any, out OutputT : Any, out RenderingT : Any>
      * @param context The [CoroutineContext] used to run the workflow tree. Added to the [Factory]'s
      * context.
      */
-    fun <InputT : Any, OutputT : Any, RenderingT : Any> run(
+    fun <InputT, OutputT : Any, RenderingT> run(
       workflow: Workflow<InputT, OutputT, RenderingT>,
       inputs: ReceiveChannel<InputT>,
       snapshot: Snapshot? = null,
@@ -103,7 +103,7 @@ interface WorkflowHost<in InputT : Any, out OutputT : Any, out RenderingT : Any>
           }
       }
 
-    fun <OutputT : Any, RenderingT : Any> run(
+    fun <OutputT : Any, RenderingT> run(
       workflow: Workflow<Unit, OutputT, RenderingT>,
       snapshot: Snapshot? = null,
       context: CoroutineContext = EmptyCoroutineContext
@@ -118,7 +118,7 @@ interface WorkflowHost<in InputT : Any, out OutputT : Any, out RenderingT : Any>
      * the testing extension method defined there on your workflow itself.
      */
     @TestOnly
-    fun <InputT : Any, StateT : Any, OutputT : Any, RenderingT : Any> runTestFromState(
+    fun <InputT, StateT : Any, OutputT : Any, RenderingT> runTestFromState(
       workflow: StatefulWorkflow<InputT, StateT, OutputT, RenderingT>,
       inputs: ReceiveChannel<InputT>,
       initialState: StateT
@@ -153,7 +153,7 @@ interface WorkflowHost<in InputT : Any, out OutputT : Any, out RenderingT : Any>
  * favorite Rx library to map a stream of [InputT]s into [Update]s.
  */
 @UseExperimental(InternalCoroutinesApi::class)
-suspend fun <InputT : Any, StateT : Any, OutputT : Any, RenderingT : Any> runWorkflowTree(
+suspend fun <InputT, StateT, OutputT : Any, RenderingT> runWorkflowTree(
   workflow: StatefulWorkflow<InputT, StateT, OutputT, RenderingT>,
   inputs: ReceiveChannel<InputT>,
   initialSnapshot: Snapshot?,

kotlin/workflow-runtime/src/main/java/com/squareup/workflow/internal/Behavior.kt

@@ -28,7 +28,7 @@ import kotlinx.coroutines.Deferred
  *
  * @see RealRenderContext
  */
-internal data class Behavior<StateT : Any, out OutputT : Any>(
+internal data class Behavior<StateT, out OutputT : Any>(
   val childCases: List<WorkflowOutputCase<*, *, StateT, OutputT>>,
   val workerCases: List<WorkerCase<*, StateT, OutputT>>,
   val nextActionFromEvent: Deferred<WorkflowAction<StateT, OutputT>>
@@ -38,7 +38,7 @@ internal data class Behavior<StateT : Any, out OutputT : Any>(
   data class WorkflowOutputCase<
       ChildInputT : Any,
       ChildOutputT : Any,
-      ParentStateT : Any,
+      ParentStateT,
       out ParentOutputT : Any
       >(
         val workflow: Workflow<*, ChildOutputT, *>,
@@ -52,7 +52,7 @@ internal data class Behavior<StateT : Any, out OutputT : Any>(
       }
       // @formatter:on
 
-  data class WorkerCase<T, StateT : Any, out OutputT : Any>(
+  data class WorkerCase<T, StateT, out OutputT : Any>(
     val worker: Worker<T>,
     val key: String,
     val handler: (OutputOrFinished<T>) -> WorkflowAction<StateT, OutputT>

kotlin/workflow-runtime/src/main/java/com/squareup/workflow/internal/RealRenderContext.kt

@@ -28,11 +28,11 @@ import kotlinx.coroutines.CompletableDeferred
 /**
  * An implementation of [RenderContext] that builds a [Behavior] via [buildBehavior].
  */
-internal class RealRenderContext<StateT : Any, OutputT : Any>(
+internal class RealRenderContext<StateT, OutputT : Any>(
   private val renderer: Renderer<StateT, OutputT>
 ) : RenderContext<StateT, OutputT> {
 
-  interface Renderer<StateT : Any, in OutputT : Any> {
+  interface Renderer<StateT, in OutputT : Any> {
     fun <ChildInputT : Any, ChildOutputT : Any, ChildRenderingT : Any> render(
       case: WorkflowOutputCase<ChildInputT, ChildOutputT, StateT, OutputT>,
       child: Workflow<ChildInputT, ChildOutputT, ChildRenderingT>,

kotlin/workflow-runtime/src/main/java/com/squareup/workflow/internal/SubtreeManager.kt

@@ -30,7 +30,7 @@ import kotlin.coroutines.CoroutineContext
  * Responsible for tracking child workflows, starting them and tearing them down when necessary. Also
  * manages restoring children from snapshots.
  */
-internal class SubtreeManager<StateT : Any, OutputT : Any>(
+internal class SubtreeManager<StateT, OutputT : Any>(
   private val contextForChildren: CoroutineContext
 ) : RealRenderContext.Renderer<StateT, OutputT> {
 

kotlin/workflow-runtime/src/main/java/com/squareup/workflow/internal/WorkflowId.kt

@@ -30,16 +30,16 @@ internal typealias AnyId = WorkflowId<*, *, *>
  * Value type that can be used to distinguish between different workflows of different types or
  * the same type (in that case using a [name]).
  */
-internal data class WorkflowId<in InputT : Any, out OutputT : Any, out RenderingT : Any>
+internal data class WorkflowId<in InputT, out OutputT : Any, out RenderingT>
 @PublishedApi
 internal constructor(
   internal val type: KClass<out Workflow<InputT, OutputT, RenderingT>>,
   internal val name: String = ""
 )
 
 @Suppress("unused")
-internal fun <W : Workflow<P, O, R>, P : Any, O : Any, R : Any>
-    W.id(key: String = ""): WorkflowId<P, O, R> =
+internal fun <W : Workflow<I, O, R>, I, O : Any, R>
+    W.id(key: String = ""): WorkflowId<I, O, R> =
   WorkflowId(this::class, key)
 
 internal fun WorkflowId<*, *, *>.toByteString(): ByteString = Buffer()

kotlin/workflow-runtime/src/main/java/com/squareup/workflow/internal/WorkflowNode.kt

@@ -39,7 +39,7 @@ import kotlin.coroutines.CoroutineContext
  * @param initialState Allows unit tests to start the node from a given state, instead of calling
  * [StatefulWorkflow.initialState].
  */
-internal class WorkflowNode<InputT : Any, StateT : Any, OutputT : Any, RenderingT : Any>(
+internal class WorkflowNode<InputT, StateT, OutputT : Any, RenderingT>(
   val id: WorkflowId<InputT, OutputT, RenderingT>,
   workflow: StatefulWorkflow<InputT, StateT, OutputT, RenderingT>,
   initialInput: InputT,

kotlin/workflow-testing/src/main/java/com/squareup/workflow/testing/WorkflowTester.kt

@@ -51,7 +51,7 @@ import kotlin.coroutines.EmptyCoroutineContext
  *  - [sendInput]
  *    - Send a new [InputT] to the root workflow.
  */
-class WorkflowTester<InputT : Any, OutputT : Any, RenderingT : Any> @TestOnly internal constructor(
+class WorkflowTester<InputT, OutputT : Any, RenderingT> @TestOnly internal constructor(
   private val inputs: SendChannel<InputT>,
   private val host: WorkflowHost<InputT, OutputT, RenderingT>,
   context: CoroutineContext
@@ -191,7 +191,7 @@ class WorkflowTester<InputT : Any, OutputT : Any, RenderingT : Any> @TestOnly in
  */
 // @formatter:off
 @TestOnly
-fun <T, InputT : Any, OutputT : Any, RenderingT : Any>
+fun <T, InputT, OutputT : Any, RenderingT>
     Workflow<InputT, OutputT, RenderingT>.testFromStart(
       input: InputT,
       snapshot: Snapshot? = null,
@@ -209,7 +209,7 @@ fun <T, InputT : Any, OutputT : Any, RenderingT : Any>
  * All workflow-related coroutines are cancelled when the block exits.
  */
 @TestOnly
-fun <T, OutputT : Any, RenderingT : Any> Workflow<Unit, OutputT, RenderingT>.testFromStart(
+fun <T, OutputT : Any, RenderingT> Workflow<Unit, OutputT, RenderingT>.testFromStart(
   snapshot: Snapshot? = null,
   context: CoroutineContext = EmptyCoroutineContext,
   block: WorkflowTester<Unit, OutputT, RenderingT>.() -> T
@@ -224,7 +224,7 @@ fun <T, OutputT : Any, RenderingT : Any> Workflow<Unit, OutputT, RenderingT>.tes
  */
 // @formatter:off
 @TestOnly
-fun <T, InputT : Any, StateT : Any, OutputT : Any, RenderingT : Any>
+fun <T, InputT, StateT : Any, OutputT : Any, RenderingT>
     StatefulWorkflow<InputT, StateT, OutputT, RenderingT>.testFromState(
       input: InputT,
       initialState: StateT,
@@ -245,7 +245,7 @@ fun <T, InputT : Any, StateT : Any, OutputT : Any, RenderingT : Any>
  */
 // @formatter:off
 @TestOnly
-fun <StateT : Any, OutputT : Any, RenderingT : Any>
+fun <StateT : Any, OutputT : Any, RenderingT>
     StatefulWorkflow<Unit, StateT, OutputT, RenderingT>.testFromState(
       initialState: StateT,
       context: CoroutineContext = EmptyCoroutineContext,
@@ -254,7 +254,7 @@ fun <StateT : Any, OutputT : Any, RenderingT : Any>
 // @formatter:on
 
 @UseExperimental(InternalCoroutinesApi::class)
-private fun <T, I : Any, O : Any, R : Any> test(
+private fun <T, I, O : Any, R> test(
   testBlock: (WorkflowTester<I, O, R>) -> T,
   baseContext: CoroutineContext,
   starter: (WorkflowHost.Factory, inputs: Channel<I>) -> WorkflowHost<I, O, R>