It should, yes. But don't expect it to in any 5.8.x release. The maint pumpking is very cautious about adding new warnings, and for a while there were a number of people advocating 
sub foo {
   my $x if 0;
   ...
}

[download]
to create a "static" variable, rather than using a closure 
{
   my $x;
   sub foo {
      ...
   }
}

[download]

In reply to Re^2: "if" in a my declaration statement causes problem by ysth
in thread "if" in a my declaration statement causes problem by ganeshk

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