Implicit receiver smart casts implementation and highlighting

compiler/testData/diagnostics/tests/generics/nullability/smartCastsOnThis.kt

@@ -25,7 +25,7 @@ fun <T : String?> T.foo() {
     <!UNSAFE_CALL!>length<!>
 
     if (this is String) {
-        length
+        <!DEBUG_INFO_IMPLICIT_RECEIVER_SMARTCAST!>length<!>
         this<!UNNECESSARY_SAFE_CALL!>?.<!>length
 
         bar1()

compiler/testData/diagnostics/tests/nullabilityAndSmartCasts/kt2109.kt

@@ -9,7 +9,7 @@ fun A?.bar() {
     if (this == null) {
         return
     }
-    foo()
+    <!DEBUG_INFO_IMPLICIT_RECEIVER_SMARTCAST!>foo<!>()
 }
 
 fun A.baz() {

compiler/testData/diagnostics/tests/smartCasts/falseReceiverSmartCast.kt

@@ -0,0 +1,15 @@
+open class SuperFoo {
+    public fun bar(): String {
+        if (this is Foo) {
+            <!DEBUG_INFO_IMPLICIT_RECEIVER_SMARTCAST!>superFoo<!>()
+            return baz()
+        }
+        return baz()
+    }
+
+    public fun baz() = "OK"
+}
+
+class Foo : SuperFoo() {
+    public fun superFoo() {}
+}

compiler/testData/diagnostics/tests/smartCasts/falseReceiverSmartCast.txt

@@ -0,0 +1,20 @@
+package
+
+public final class Foo : SuperFoo {
+    public constructor Foo()
+    public final override /*1*/ /*fake_override*/ fun bar(): kotlin.String
+    public final override /*1*/ /*fake_override*/ fun baz(): kotlin.String
+    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 final fun superFoo(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public open class SuperFoo {
+    public constructor SuperFoo()
+    public final fun bar(): kotlin.String
+    public final fun baz(): kotlin.String
+    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/tests/smartCasts/implicitReceiver.kt

@@ -0,0 +1,24 @@
+open class A {
+    class B : A() {
+        val a = "FAIL"
+    }
+
+    fun foo(): String {
+        if (this is B) return <!DEBUG_INFO_IMPLICIT_RECEIVER_SMARTCAST!>a<!>
+        return "OK"
+    }
+}
+
+fun A?.bar() {
+    if (this != null) <!DEBUG_INFO_IMPLICIT_RECEIVER_SMARTCAST!>foo<!>()
+}
+
+fun A.gav() = if (this is A.B) <!DEBUG_INFO_IMPLICIT_RECEIVER_SMARTCAST!>a<!> else ""
+
+class C {
+    fun A?.complex(): String {
+        if (this is A.B) return <!DEBUG_INFO_IMPLICIT_RECEIVER_SMARTCAST!>a<!>
+        else if (this != null) return <!DEBUG_INFO_IMPLICIT_RECEIVER_SMARTCAST!>foo<!>()
+        else return ""
+    }
+}

compiler/testData/diagnostics/tests/smartCasts/implicitReceiver.txt

@@ -0,0 +1,29 @@
+package
+
+public fun A?.bar(): kotlin.Unit
+public fun A.gav(): kotlin.String
+
+public open class A {
+    public constructor A()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun foo(): kotlin.String
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    public final class B : A {
+        public constructor B()
+        public final val a: kotlin.String = "FAIL"
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public final override /*1*/ /*fake_override*/ fun foo(): kotlin.String
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}
+
+public final class C {
+    public constructor C()
+    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 fun A?.complex(): kotlin.String
+}

compiler/testData/diagnostics/tests/smartCasts/implicitToGrandSon.kt

@@ -0,0 +1,11 @@
+open class A {
+    open fun foo() = "FAIL"
+
+    fun bar() = if (this is C) <!DEBUG_INFO_IMPLICIT_RECEIVER_SMARTCAST!>foo<!>() else "FAIL"
+}
+
+open class B : A()
+
+open class C : B() {
+    override fun foo() = "OK"
+}

compiler/testData/diagnostics/tests/smartCasts/implicitToGrandSon.txt

@@ -0,0 +1,28 @@
+package
+
+public open class A {
+    public constructor A()
+    public final fun bar(): kotlin.String
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun foo(): kotlin.String
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public open class B : A {
+    public constructor B()
+    public final override /*1*/ /*fake_override*/ fun bar(): kotlin.String
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun foo(): kotlin.String
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public open class C : B {
+    public constructor C()
+    public final override /*1*/ /*fake_override*/ fun bar(): kotlin.String
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ fun foo(): kotlin.String
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/tests/syntheticExtensions/javaProperties/SmartCastImplicitReceiver.kt

@@ -1,8 +1,8 @@
 // FILE: KotlinFile.kt
 fun Any.foo(): Int {
     if (this is JavaClass) {
-        something++
-        return x
+        <!DEBUG_INFO_IMPLICIT_RECEIVER_SMARTCAST!>something<!>++
+        return <!DEBUG_INFO_IMPLICIT_RECEIVER_SMARTCAST!>x<!>
     }
     return 0
 }