1--TEST-- 2Bug #71978 (Existence of return type hint affects other compatibility rules) 3--FILE-- 4<?php 5class A1 { 6 function foo(int $a): int {} 7} 8class B1 extends A1 { 9 function foo(string $a): int {} 10} 11?> 12--EXPECTF-- 13Fatal error: Declaration of B1::foo(string $a): int must be compatible with A1::foo(int $a): int in %s on line %d 14