Fix Geiser for Guile 3.0.6

Fixes emacs-geiser/guile#9

In geiser-eval REPL meta-command:
All `mod`, `form` and `args` are now syntax objects. The
geiser-guile's logic will handle `mod` and `form` as is because
they're just passed to guile's eval and compile procedures.
`args` are processed by geiser-eval meta-command itself, so
it's necessary to convert it back to a datum. We lose some metadata,
but all elements in the `args` list are also syntax objects so I don't
think it's a big deal.

`syntax->datum` was introduced before guile 2 so this change is
backward compatible.

1 files changed, 6 insertions, 5 deletions

diff --git a/src/geiser/emacs.scm b/src/geiser/emacs.scm
index 6f2fc29..555add2 100644
--- a/src/geiser/emacs.scm
+++ b/src/geiser/emacs.scm
@@ -35,11 +35,12 @@ Meta-command used by Geiser to emit a new line."
 (define-meta-command ((geiser-eval geiser) repl (mod form args) . rest)
   "geiser-eval module form args ()
 Meta-command used by Geiser to evaluate and compile code."
-  (if (null? args)
-      (call-with-error-handling
-       (lambda () (ge:compile form mod)))
-      (let ((proc (eval form this-module)))
-        (ge:eval `(,proc ,@args) mod))))
+  (let ((args (syntax->datum args)))
+    (if (null? args)
+	(call-with-error-handling
+	 (lambda () (ge:compile form mod)))
+	(let ((proc (eval form this-module)))
+          (ge:eval `(,proc ,@args) mod)))))
 
 (define-meta-command ((geiser-load-file geiser) repl file)
   "geiser-load-file file