PhpCsFixer\Fixer\ReturnNotation\NoUselessReturnFixer::fix PHP Method

    public function fix(\SplFileInfo $file, Tokens $tokens)
    {
        foreach ($tokens as $index => $token) {
            if (!$token->isGivenKind(T_FUNCTION)) {
                continue;
            }
            $index = $tokens->getNextTokenOfKind($index, array(';', '{'));
            if ($tokens[$index]->equals('{')) {
                $this->fixFunction($tokens, $index, $tokens->findBlockEnd(Tokens::BLOCK_TYPE_CURLY_BRACE, $index));
            }
        }
    }