> Do be aware that the \ splice thing is not yet officially part of
> sweet-expressions; dwheeler made a draft of the splice rules but hasn't
> made a 0.3 sweet-expressions spec including it.

Do you mean the one here?
- http://www.dwheeler.com/readable/sweet-expressions.html

> - If it's the last character of the line (other than 0 or more
>   spaces/tabs), then the newline is considered a space, and the next
>   line's indentation is irrelevant. This continues the line. (Note
>   that comments cannot follow, because that would be confusing.)

This sounds quite interesting, because it is a standard known to many
people (from bash and python :) ).

> - If it's between items on a line, it's interpreted as a line break to
>   the same indentation level.

This sounds quite, though.  It gives \ doublemeaning. And not being
able to add comments behing the \ looks rather like trying to avoid
making the ambiguity introduced by the inline \.

I’m already not completely happy about using . for groups (because it
introduces additional rules - but it already is a special syntax
element, so it does not hurt too much).

But at least in elisp, the following is valid syntax:

(defun \ () 
       (message "\\"))
(\ )  

This is not, though:
(\).

So I am pretty certain, that (defun \ () ()) just defines " " to be a
function… though I’m not sure about that. 
(insert (stringp '(\ \ ))) complains that it is nil… 

Notes on that: 
http://ftp.gnu.org/old-gnu/Manuals/elisp-manual-21-2.8/html_node/elisp_22.html

> - Otherwise, if it's at the beginning of a line (after 0+
>   spaces/tabs), it's ignored - but the first non-whitespace
>   character's indentation level is used.

It allows making structure with whitespace which is not interpreted by
the parser. And I think that makes it ambigous.

> For now I think we should investigate the following alternatives:
> 
> 1.  \ = GROUP = SPLICE, remove SPLICE-at-the-eol rule.
> 
> 2.  . = GROUP, \  = SPLICE
> 2.1.  remove SPLICE-at-the-eol rule.
> 2.2. don't remove SPLICE-at-the-eol rule.

or:
2.3 remove SPLICE inline rule

Best wishes,
Arne

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