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From: Ralf Fassel <ralfixx@gmx.de>
Newsgroups: comp.lang.tcl
Subject: Re: failing to understand/use lambda
Date: Wed, 25 Jun 2025 11:02:09 +0200
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* Mark Summerfield <m.n.summerfield@gmail.com>
| oo::define Store method add {args} {
|     puts "action: adding [llength $args] new files"
|     $Reporter "adding [llength $args] new files"
| }
--<snip-snip>--
| Actual output:
>
| action: adding 3 new files
| invalid command name "::apply {message { puts "reporter: $message" }}"

Note that I have no experience with lambda(n), but the error message
sounds like you need

  {*}$Reporter "adding ..."

when calling the reporter (i.e. expand the command being called).

HTH
R'