bug#49623: Guile 3.0.7 can't read #{{}}#

[Maxime Devos]

Hi,

A scheme library I'm working on now fails to compile
after switching from 3.0.2 to Guile 3.0.7.  The issue
is that Guile can't read #{{}}# anymore.

In guile 3.0.7:

scheme@(guile-user)> '#{{}}# }#
$1 = #{\x7b;\x7d;# }# ; the }# should result in a syntax error
scheme@(guile-user)> '#{{}}# ; this should work
...
; ^ guile is waiting for input

In guile 3.0.2:
scheme@(guile-user)> '#{{}}#
$1 = #{\x7b;\x7d;}# ; ok!

(Yes, I really name my variables like that sometimes.)

Note that #{{}a}# can be read just fine by both guile versions.

Greetings,
Maxime.

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