ah. sorry for the confusion.

This is a VASTLY simplified section of code. in practice its more like:

sub configure {
   my $setting_a= undef;
   my $setting_b= undef;
   {
     run a bunch of things setting combinations of a or b , last
  }
  do someting with settings a and b
}
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there are too many sub vars needed in the block to have that stuff in a seperate sub without passing tons of args around -- so i wanted to localize them in a breakable block