Arrow Functions and compact method cause false positive for UndefinedVariable bug

[yokozawa0701]

Here's a simple example that generates UndefinedVariable for using the Arrow Functions and compact method.

$something = fn ($arg) => compact('arg');  // Unused function parameter $arg. (VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable) 

I am using v2.11.19.
Thank you.

[sirbrillig]

Good find. I think this is happening because processCompact() calls findVariableScope() which has a special case for arrow function variables but needs the name of the variable itself, and we don't pass that (there could be many). Working on how to handle that case.

[sirbrillig]

This should be fixed by #339