GNU bug report logs - #31864
Hex-escaped r6rs symbols are not read correctly

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From: =?utf-8?Q?G=C3=B6ran?= Weinholt <goran@HIDDEN>
To: bug-guile@HIDDEN
Subject: Hex-escaped r6rs symbols are not read correctly
Date: Sat, 16 Jun 2018 23:04:39 +0200
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Hello schemers!

R6RS specifies an inline hex escape syntax for symbols. These do not
work in Guile 2.2.3:

scheme@(guile-user)> (read-enable 'r6rs-hex-escapes)
$1 =3D (square-brackets r6rs-hex-escapes keywords #f positions)
scheme@(guile-user)> (symbol->string '\x7c;
)
$2 =3D "\\x7c"

I expected this to return "|".

While fixing this, perhaps it would also be possible to add recognition
of #!r6rs to set the appropriate per-port read options, similarly to how
#!fold-case is recognized? It would make it much easier to load R6RS
code in Guile.

Best Regards,

--=20
G=C3=B6ran Weinholt
Debian developer
73 de SA6CJK