[PSI, FE, PSI2IR] Use labels for referencing specific receiver

core/descriptors/src/org/jetbrains/kotlin/resolve/DescriptorFactory.java

@@ -188,9 +188,19 @@ public class DescriptorFactory {
             @NotNull CallableDescriptor owner,
             @Nullable KotlinType receiverParameterType,
             @NotNull Annotations annotations
+    ) {
+        return createExtensionReceiverParameterForCallable(owner, receiverParameterType, annotations, false);
+    }
+
+    @Nullable
+    public static ReceiverParameterDescriptor createExtensionReceiverParameterForCallable(
+            @NotNull CallableDescriptor owner,
+            @Nullable KotlinType receiverParameterType,
+            @NotNull Annotations annotations,
+            boolean isContextReceiver
     ) {
         return receiverParameterType == null
                ? null
-               : new ReceiverParameterDescriptorImpl(owner, new ExtensionReceiver(owner, receiverParameterType, null), annotations);
+               : new ReceiverParameterDescriptorImpl(owner, new ExtensionReceiver(owner, receiverParameterType, null, isContextReceiver), annotations);
     }
 }

core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/receivers/ExtensionReceiver.java

@@ -35,14 +35,25 @@ import org.jetbrains.kotlin.types.checker.NewKotlinTypeChecker;
 public class ExtensionReceiver extends AbstractReceiverValue implements ImplicitReceiver {
 
     private final CallableDescriptor descriptor;
+    private final boolean isContextReceiver;
 
     public ExtensionReceiver(
             @NotNull CallableDescriptor callableDescriptor,
             @NotNull KotlinType receiverType,
             @Nullable ReceiverValue original
+    ) {
+        this(callableDescriptor, receiverType, original, false);
+    }
+
+    public ExtensionReceiver(
+            @NotNull CallableDescriptor callableDescriptor,
+            @NotNull KotlinType receiverType,
+            @Nullable ReceiverValue original,
+            boolean isContextReceiver
     ) {
         super(receiverType, original);
         this.descriptor = callableDescriptor;
+        this.isContextReceiver = isContextReceiver;
     }
 
     @NotNull
@@ -61,4 +72,8 @@ public class ExtensionReceiver extends AbstractReceiverValue implements Implicit
     public String toString() {
         return getType() + ": Ext {" + descriptor + "}";
     }
+
+    public boolean isContextReceiver() {
+        return isContextReceiver;
+    }
 }