Introduce builder-like inference with an explicit opt-in for it

- Add marker for the experimental type inference features
 - Add annotation that will control builder-like inference
 - Require that annotation on corresponding parameters and extensions
 - Allow to use builder inference without suspendability

 Changes in tests and refactorings (rename mainly) are going to be
 introduced in further commits

compiler/testData/diagnostics/testsWithStdLib/coroutines/inference/resolveUsualCallWithBuilderInference.kt

@@ -0,0 +1,37 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+// FILE: annotation.kt
+
+package kotlin
+
+annotation class BuilderInference
+
+// FILE: test.kt
+
+class Builder<T> {
+    fun add(t: T) {}
+}
+
+fun <S> build(@BuilderInference g: Builder<S>.() -> Unit): List<S> = TODO()
+fun <S> wrongBuild(g: Builder<S>.() -> Unit): List<S> = TODO()
+
+fun <S> Builder<S>.extensionAdd(s: S) {}
+
+@BuilderInference
+fun <S> Builder<S>.safeExtensionAdd(s: S) {}
+
+val member = build {
+    add(42)
+}
+
+val memberWithoutAnn = <!TYPE_INFERENCE_NO_INFORMATION_FOR_PARAMETER!>wrongBuild<!> {
+    add(42)
+}
+
+val extension = <!TYPE_INFERENCE_NO_INFORMATION_FOR_PARAMETER!>build<!> {
+    extensionAdd("foo")
+}
+
+val safeExtension = build {
+    safeExtensionAdd("foo")
+}

compiler/testData/diagnostics/testsWithStdLib/coroutines/inference/resolveUsualCallWithBuilderInference.txt

@@ -0,0 +1,32 @@
+package
+
+public val extension: [ERROR : Type for build {
+    extensionAdd("foo")
+}]
+public val member: kotlin.collections.List<kotlin.Int>
+public val memberWithoutAnn: [ERROR : Type for wrongBuild {
+    add(42)
+}]
+public val safeExtension: kotlin.collections.List<kotlin.String>
+public fun </*0*/ S> build(/*0*/ @kotlin.BuilderInference g: Builder<S>.() -> kotlin.Unit): kotlin.collections.List<S>
+public fun </*0*/ S> wrongBuild(/*0*/ g: Builder<S>.() -> kotlin.Unit): kotlin.collections.List<S>
+public fun </*0*/ S> Builder<S>.extensionAdd(/*0*/ s: S): kotlin.Unit
+@kotlin.BuilderInference public fun </*0*/ S> Builder<S>.safeExtensionAdd(/*0*/ s: S): kotlin.Unit
+
+public final class Builder</*0*/ T> {
+    public constructor Builder</*0*/ T>()
+    public final fun add(/*0*/ t: T): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+package kotlin {
+
+    public final annotation class BuilderInference : kotlin.Annotation {
+        public constructor BuilderInference()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}

compiler/testData/diagnostics/testsWithStdLib/coroutines/inference/useInferenceInformationFromExtension.kt

@@ -0,0 +1,32 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+// FILE: annotation.kt
+
+package kotlin
+
+annotation class BuilderInference
+
+// FILE: test.kt
+
+class GenericController<T> {
+    suspend fun yield(t: T) {}
+}
+
+suspend fun <S> GenericController<S>.extensionYield(s: S) {}
+
+@BuilderInference
+suspend fun <S> GenericController<S>.safeExtensionYield(s: S) {}
+
+fun <S> generate(@BuilderInference g: suspend GenericController<S>.() -> Unit): List<S> = TODO()
+
+val normal = generate {
+    yield(42)
+}
+
+val extension = <!TYPE_INFERENCE_NO_INFORMATION_FOR_PARAMETER!>generate<!> {
+    extensionYield("foo")
+}
+
+val safeExtension = generate {
+    safeExtensionYield("foo")
+}

compiler/testData/diagnostics/testsWithStdLib/coroutines/inference/useInferenceInformationFromExtension.txt

@@ -0,0 +1,28 @@
+package
+
+public val extension: [ERROR : Type for generate {
+    extensionYield("foo")
+}]
+public val normal: kotlin.collections.List<kotlin.Int>
+public val safeExtension: kotlin.collections.List<kotlin.String>
+public fun </*0*/ S> generate(/*0*/ @kotlin.BuilderInference g: suspend GenericController<S>.() -> kotlin.Unit): kotlin.collections.List<S>
+public suspend fun </*0*/ S> GenericController<S>.extensionYield(/*0*/ s: S): kotlin.Unit
+@kotlin.BuilderInference public suspend fun </*0*/ S> GenericController<S>.safeExtensionYield(/*0*/ s: S): kotlin.Unit
+
+public final class GenericController</*0*/ T> {
+    public constructor GenericController</*0*/ T>()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    public final suspend fun yield(/*0*/ t: T): kotlin.Unit
+}
+
+package kotlin {
+
+    public final annotation class BuilderInference : kotlin.Annotation {
+        public constructor BuilderInference()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}