This patch was submitted upstream:
https://github.com/scheme/scsh/pull/46

diff --git a/scheme/lib-dirs.scm b/scheme/lib-dirs.scm
index a1fc009..c630fb4 100644
--- a/scheme/lib-dirs.scm
+++ b/scheme/lib-dirs.scm
@@ -75,6 +75,7 @@
               (let ((val (read)))
                 (cond ((eof-object? val) '())
                       ((string? val) (cons val (recur)))
+                      ((symbol? val) (cons (symbol->string val) (recur)))
                       ((not val) (append default-lib-dirs (recur)))
                       (else 
                        (error 
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<tr><td><span title='2022-01-17 00:18:23 +0100'>2022-01-17</span></td><td><a href='/guix/commit/gnu/packages/matrix.scm?id=863b7b7dd7059e9e2c78f89b501919042159eccd'>gnu: pantalaimon: Add needed inputs</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/matrix.scm (pantalaimon)
&lt;propagated-inputs&gt;: Add python-dbus, python-notify2, python-pydbus, and
python-pygobject.
&lt;arguments&gt;: Run sanity-check phase.

Co-authored-by: Aleksandr Vityazev &lt;avityazev@posteo.org&gt;
Signed-off-by: Nicolas Goaziou &lt;mail@nicolasgoaziou.fr&gt;
</span></span></td><td>Morgan Smith</td></tr>
<tr><td><span title='2022-01-12 23:50:15 +0100'>2022-01-12</span></td><td><a href='/guix/commit/gnu/packages/matrix.scm?id=fb6de84a6b9ed38fc4fbf4fad89a0f8fe25111eb'>gnu: python-matrix-synapse-ldap3: Fix build.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/matrix.scm (python-matrix-synapse-ldap3)[arguments]: Delete
sanity check.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2022-01-11 18:36:38 +0100'>2022-01-11</span></td><td><a href='/guix/commit/gnu/packages/matrix.scm?id=6a86d59e28250771a3a0537108869f8c5bdee0a4'>gnu: pantalaimon: Disable sanity check.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/matrix.scm (pantalaimon)[arguments]: Disable sanity-check phase.
</span></span></td><td>Marius Bakke</td></tr>