[doc://perlsyn] goes to perlsyn which currently claims to be 5.8.8 vintage and says:

NOTE: The behaviour of a my statement modified with a statement modifier conditional or loop construct (e.g. my $x if ... ) is undefined. [etc.]

In case that helps you in future searches or something. Perhaps the highlighting tripped up your grep or something? :)

Update: DYK you can type "doc://perlsyn" in the 'Search' box found at the top of most PerlMonks pages and be taken to the same place as [doc://perlsyn] ? FYI. I use that feature all the time. [ For example, type "abbr://dyk" if that abbr. isn't familiar or type "abbr://fyi" to see a bunch of expansions that don't match what I meant (and one that did) :]