1--TEST-- 2Test that the mixed return type is not compatible with a void return value in strict mode 3--FILE-- 4<?php 5declare(strict_types=1); 6 7function foo(): mixed 8{ 9} 10 11try { 12 foo(); 13} catch (TypeError $exception) { 14 echo $exception->getMessage() . "\n"; 15} 16 17?> 18--EXPECT-- 19foo(): Return value must be of type mixed, none returned 20