Hi Maxime, Thanks for hint with the explanation. I'm still learning. Below the second try.
Best Regards Hannes >From 5eb06c5d22799170289ab55ab5a8eab45a98b390 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Hannes=20M=C3=BCller?= <> Date: Sun, 2 Feb 2025 21:32:18 +0100 Subject: [PATCH v2] Fix make-custom-port in case encoding is #f * module/ice-9/custom-ports.scm (make-custom-port): Code fails if (fluid-ref %default-port-encoding) returns #f. In fact this was the case why readline support on MSYS2 failed for guile 3.0.10, ref. https://github.com/msys2/MSYS2-packages/issues/5079 But later used canonicalize-encoding is prepared to handle #f for encoding. So allow encoding to also handle this case. --- module/ice-9/custom-ports.scm | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/module/ice-9/custom-ports.scm b/module/ice-9/custom-ports.scm index 6010fd94f..c4376db7b 100644 --- a/module/ice-9/custom-ports.scm +++ b/module/ice-9/custom-ports.scm @@ -127,7 +127,7 @@ (id "custom-port") (print (make-default-print #:id id)) (truncate default-truncate) - (encoding (string->symbol (fluid-ref %default-port-encoding))) + (encoding (and=> (fluid-ref %default-port-encoding) string->symbol)) (conversion-strategy (fluid-ref %default-port-conversion-strategy)) (close-on-gc? #f)) "Create a custom port whose behavior is determined by the methods passed -- 2.39.5
