Only lexical aka static scopes.

Eg local has a dynamic scope.

<edit>
Because of LanX answer below:
Well, local has no scope at all - it just masks a (package) global at runtime until the localizing goes out of (lexical) scope, but that's just nitpicking at wording perhaps. See also my/local, space/time (was: Re: The difference between my and local).

local has a static scope. Localized variables have a dynamic scope.
</edit>

But here you answered the question for yourself. The warning bits are compiled into each lexical scope at compile time, and a local $^W = $my_bits doesn't change them at runtime for scopes further down.

So there are two possibilities:

  1. localize $SIG{__WARN__} to propagate a runtime behavior
  2. compile and eval code to be called with a current $^W at runtime
perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'

In reply to Re^3: Disabling runtime warnings in dynamic scope? by shmem
in thread Disabling runtime warnings in dynamic scope? by LanX

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