Error Identifiers: closure.*

There are 4 error identifiers in the closure.* group:

closure.unusedUse

Variable imported in the closure's use clause is never used.
closure.useDuplicate non-ignorable

Closure's use clause imports a variable that conflicts with a parameter name.
closure.useSuperGlobal

Superglobal variable is used in a closure use clause, which is not allowed.
closure.useThis non-ignorable

Closure attempts to import $this via the use clause.

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