@NotNull
public Collection<KotlinType> getSupertypesForFunctionReference(
@NotNull FunctionDescriptor descriptor) {
ReceiverParameterDescriptor extensionReceiver = descriptor.getExtensionReceiverParameter();
ReceiverParameterDescriptor dispatchReceiver = descriptor.getDispatchReceiverParameter();
KotlinType receiverType =
extensionReceiver != null
? extensionReceiver.getType()
: dispatchReceiver != null ? dispatchReceiver.getType() : null;
//noinspection ConstantConditions
KotlinType functionType =
DescriptorUtilsKt.getBuiltIns(descriptor)
.getFunctionType(
Annotations.Companion.getEMPTY(),
receiverType,
ExpressionTypingUtils.getValueParametersTypes(descriptor.getValueParameters()),
descriptor.getReturnType());
return Arrays.asList(functionReference.getDefaultType(), functionType);
}
