False positive for unused/undefined variable in arrow function when used inside double quotes

[ocean90]

See the following example:

$allowed_extensions = array_map( fn( $extension ) => ".$extension", $allowed_extensions );

// Unused function parameter $extension. (VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable)
// Variable $extension is undefined. (VariableAnalysis.CodeAnalysis.VariableAnalysis.UndefinedVariable)

Fwiw, the same doesn't happen when using a closure.

[sirbrillig]

Thank you! It turns out the extra variable detection I had to add for arrow functions was looking at the token's content (".$extension" in your example) when it was trying to find the variable name, rather than using the (already extracted and normalized) proper variable name. Fixed in #222