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<?php declare(strict_types=1); trait UiHelperTrait { public function drupalGet(string $url): string { return '<html><body><h1>Something</h1></body></html>'; } } class BrowserTestBase { use UiHelperTrait; } class OverrideTraitMethodSignatureInChildClassTest extends BrowserTestBase { public function drupalGet(string $url): int { return 200; } } $test = new OverrideTraitMethodSignatureInChildClassTest(); var_dump($test->drupalGet('https://drupal.org'));
Output for 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Fatal error: Declaration of OverrideTraitMethodSignatureInChildClassTest::drupalGet(string $url): int must be compatible with BrowserTestBase::drupalGet(string $url): string in /in/8RLDn on line 19
Process exited with code 255.
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