[FE] Add language feature for context receivers

compiler/testData/diagnostics/tests/extensions/contextReceivers/fromKEEP/autoCloseScope.kt

@@ -1,4 +1,6 @@
+// !LANGUAGE: +ContextReceivers
 // FIR_IDENTICAL
+
 class File(name: String)
 interface InputStream
 

compiler/testData/diagnostics/tests/extensions/contextReceivers/fromKEEP/canvas.kt

@@ -1,3 +1,4 @@
+// !LANGUAGE: +ContextReceivers
 // FIR_IDENTICAL
 
 interface Canvas

compiler/testData/diagnostics/tests/extensions/contextReceivers/fromKEEP/clickHandler.kt

@@ -1,3 +1,4 @@
+// !LANGUAGE: +ContextReceivers
 // FIR_IDENTICAL
 
 class Button

compiler/testData/diagnostics/tests/extensions/contextReceivers/fromKEEP/compareTo.fir.kt

@@ -1,3 +1,5 @@
+// !LANGUAGE: +ContextReceivers
+
 data class Pair<A, B>(val first: A, val second: B)
 
 context(Comparator<T>)

compiler/testData/diagnostics/tests/extensions/contextReceivers/fromKEEP/compareTo.kt

@@ -1,3 +1,5 @@
+// !LANGUAGE: +ContextReceivers
+
 data class Pair<A, B>(val first: A, val second: B)
 
 context(Comparator<T>)

compiler/testData/diagnostics/tests/extensions/contextReceivers/fromKEEP/dp.fir.kt

@@ -1,3 +1,5 @@
+// !LANGUAGE: +ContextReceivers
+
 class View
 
 context(View) val Int.dp get() = 42 * this

compiler/testData/diagnostics/tests/extensions/contextReceivers/fromKEEP/dp.kt

@@ -1,3 +1,5 @@
+// !LANGUAGE: +ContextReceivers
+
 class View
 
 context(View) val Int.dp get() = 42 * this

compiler/testData/diagnostics/tests/extensions/contextReceivers/fromKEEP/functionalType.kt

@@ -1,3 +1,4 @@
+// !LANGUAGE: +ContextReceivers
 // !DIAGNOSTICS: -ASSIGNED_BUT_NEVER_ACCESSED_VARIABLE
 
 class Context

compiler/testData/diagnostics/tests/extensions/contextReceivers/fromKEEP/iterableClass.fir.kt

@@ -1,3 +1,5 @@
+// !LANGUAGE: +ContextReceivers
+
 typealias IterableClass<C, T> = (C) -> Iterator<T>
 
 context(IterableClass<C, T>)

compiler/testData/diagnostics/tests/extensions/contextReceivers/fromKEEP/iterableClass.kt

@@ -1,3 +1,5 @@
+// !LANGUAGE: +ContextReceivers
+
 typealias IterableClass<C, T> = (C) -> Iterator<T>
 
 context(IterableClass<C, T>)

compiler/testData/diagnostics/tests/extensions/contextReceivers/fromKEEP/json.fir.kt

@@ -1,3 +1,5 @@
+// !LANGUAGE: +ContextReceivers
+
 class JSONObject {
     fun build(): JSONObject = TODO()
 

compiler/testData/diagnostics/tests/extensions/contextReceivers/fromKEEP/json.kt

@@ -1,3 +1,5 @@
+// !LANGUAGE: +ContextReceivers
+
 class JSONObject {
     fun build(): JSONObject = TODO()
 

compiler/testData/diagnostics/tests/extensions/contextReceivers/fromKEEP/loggingContext.fir.kt

@@ -1,3 +1,5 @@
+// !LANGUAGE: +ContextReceivers
+
 interface Params
 interface Logger {
     fun info(message: String)

compiler/testData/diagnostics/tests/extensions/contextReceivers/fromKEEP/loggingContext.kt

@@ -1,3 +1,5 @@
+// !LANGUAGE: +ContextReceivers
+
 interface Params
 interface Logger {
     fun info(message: String)

compiler/testData/diagnostics/tests/extensions/contextReceivers/fromKEEP/monoidSum.fir.kt

@@ -1,3 +1,5 @@
+// !LANGUAGE: +ContextReceivers
+
 interface Semigroup<T> {
     infix fun T.combine(other: T): T
 }

compiler/testData/diagnostics/tests/extensions/contextReceivers/fromKEEP/monoidSum.kt

@@ -1,3 +1,5 @@
+// !LANGUAGE: +ContextReceivers
+
 interface Semigroup<T> {
     infix fun T.combine(other: T): T
 }

compiler/testData/diagnostics/tests/extensions/contextReceivers/fromKEEP/transaction.fir.kt

@@ -1,3 +1,5 @@
+// !LANGUAGE: +ContextReceivers
+
 class Session(var lastAccess: Any?)
 interface Transaction {
     fun loadSession(): Session

compiler/testData/diagnostics/tests/extensions/contextReceivers/fromKEEP/transaction.kt

@@ -1,3 +1,5 @@
+// !LANGUAGE: +ContextReceivers
+
 class Session(var lastAccess: Any?)
 interface Transaction {
     fun loadSession(): Session

compiler/testData/diagnostics/tests/extensions/contextReceivers/fromKEEP/userStorage.fir.kt

@@ -1,3 +1,5 @@
+// !LANGUAGE: +ContextReceivers
+
 class Storage<T> {
     inner class Info
 

compiler/testData/diagnostics/tests/extensions/contextReceivers/fromKEEP/userStorage.kt

@@ -1,3 +1,5 @@
+// !LANGUAGE: +ContextReceivers
+
 class Storage<T> {
     inner class Info