It seems like markTestSkipped() must be provided by classes using this trait. How about adding it as abstract method to this trait?
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Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation
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$this->/** @scrutinizer ignore-call */
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markTestSkipped(
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'Requires phar.readonly to be set to 0. Either update your php.ini file or run this test with '