In a message dated Fri, 12 Apr 2002, Glenn Linderman writes: > $_ becomes lexical > $_ gets aliased to the first topic of a given clause (hence changes > value more often, but the lexical scoping helps reduce that impact)
Okay. But it sounds like you're saying that C<given>, and C<given> only, introduces a topic, and that can't be right. From Ex4: "This is a fundamental change from Perl 5, where $_ was only aliased to the current topic in a for loop. In Perl 6, the current topic -- whatever its name and however you make it the topic -- is always aliased to $_." And later: "In a Perl 6 method, the invocant (i.e. the first argument of the method, which is a reference to the object on which the method was invoked) is always the topic...." And obviously a C<CATCH> block introduces a topic (though I guess we can pretend that C<CATCH> is a special kind of C<given>). So I had (wrongly, I guess?) extended this logic to: "all blocks taking parameters introduce a topic, which is the first parameter". Which made me think that C<sub> blocks, too, introduce a topic, which would be equivalent to @_[0]. So where did I go wrong? Trey
