#1720: r7rs "write" procedure does not escape "invalid" symbols

[Chicken Trac]

#1720: r7rs "write" procedure does not escape "invalid" symbols
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            Reporter:  Duy Nguyen  |       Type:  defect
              Status:  new         |   Priority:  major
           Milestone:  someday     |  Component:  unknown
             Version:  5.2.0       |   Keywords:
Estimated difficulty:              |
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 r7rs defines an alternative way to present a symbol that's otherwise
 invalid identifiers, by putting it inside `||`. This is implementation-
 specific in r5rs.

 The problem can be seen with `(write (features))` where 64bit is not
 escaped (i.e. |64bit|) while it is for all the r7rs schemes I have my
 hands on.

 This is not a problem when within chicken because both the reader and
 writer are in sync. I found this out because I updated chibi-snow to read
 `(features)` from chicken. Chibi does not like '64bit' symbol without
 ecaping.

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Ticket URL: <https://bugs.call-cc.org/ticket/1720>
CHICKEN Scheme <https://www.call-cc.org/>
CHICKEN Scheme is a compiler for the Scheme programming language.