PHPCSStandards / PHP_CodeSniffer / 12720611510

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Tokenizer/PHP: prevent an "Undefined array key" notice during live coding

During live coding or for code containing a parse error, it was possible for the tokenizer to run into an `Undefined array key "parenthesis_closer"` error when trying to verify arrow functions.

As this error happens during the tokenization, this resulted in PHPCS silently not scanning the file - without even showing the error notice.

Fixed now.

Includes tests.

3 of 3 new or added lines in 1 file covered. (100.0%)

18969 of 24620 relevant lines covered (77.05%)

76.4 hits per line