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To:	rc@hawkwind.utcs.toronto.edu
Subject: bug in ~ ?
Date:	Wed, 26 May 1993 20:44:15 -0400
From:	Alan Watson <alan@oldp.astro.wisc.edu>
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; foo=()
; ~ $foo () bar && echo yes		[a]
; ~ $foo () && echo yes			[b]
yes
; ~ () () && echo yes			[c]
yes
; foo=foo
; ~ $foo foo bar && echo yes		[d]
yes

Question: why doesn't [a] echo yes?

This is what I think is going on: rc normally takes the arguments to a
command and makes them into a list, in the process of which any null
lists are eliminated.  While this the behaviour one normally wants, it
doesn't seem right here.  

rc doesn't seem to amalgamate the first argument of ~ with the rest (from my
reading of the grammar), so it is already a special case.