[Scheme-reports] Symbol escapes - clarification

[Shiro Kawai <shiro.kawai@x>]

This is a somewhat old issue, but I wonder how '|' symbol-escapes ended up
excluding '|' and '\' inside it.  Does it intend a room for future
extension that
vertical bar and backslashes can be included in '|' symbol escapes by escaping
them with '\', as in CL?   I searched tickets in the WG1 trac site but couldn't
find the discussions on it except ticket #16.

It's not that I'm opposing to the current syntax.  To include vertical bar
or backslash, I can still use \x7c; and \x5c; without '|'-escapes.
I'm just curious
about the rationale of the decision out of various options, notably:

- Excluding '|' within |-escapes are understandable, but why '\' is excluded,
especially if we don't allow to any extra escaping insinde '|'s?
- CL also has '|'-escapes but they don't delimit symbols, so |abc|def|ghi| is
read as a single symbol abcDEFghi.  R7RS doesn't explicitly say '|' delimits
the symbol, but also doesn't seem to allow |abc|def syntax according
to 7.1.1.  I'm fine with either way, but was it a conscious decision?

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