Scope used for :tree command

I was looking into how the :tree command works.  You can see the docs
here:

	http://www.a-a-p.org/exec/ref-commands.html#cmd-tree

Currently the commands for the :tree command are executed in a new
scope.  Thus if you want to add files to a variable you would need to do
something like this:

	source =
	:tree . {filename = .*\.c}
		_caller.source += $name
	:print $source

That looks weird, using the _caller scope.

Would there be an objection against using the current scope for the
commands?  Then you can do:

	source =
	:tree . {filename = .*\.c}
		source += $name
	:print $source

This looks more like it's a "for name in list" command.

A side effect is that any variables set in the :tree commands overwrite
existing variables in the surrounding scope.  For example, $name is
changed.  And the _caller scope is no longer available.  Thus this is
incompatible with previous versions.

Opinions?

-- 
Save the plankton - eat a whale.

 /// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net   \\\
///          Creator of Vim - Vi IMproved -- http://www.Vim.org          \\\
\\\              Project leader for A-A-P -- http://www.A-A-P.org        ///
 \\\  Help AIDS victims, buy here: http://ICCF-Holland.org/click1.html  ///


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