From 702e881289eeb8c9f77a584ffb7b1e690b22ec8e Mon Sep 17 00:00:00 2001
From: Alex Shinn <alexshinn@gmail.com>
Date: Fri, 20 Sep 2024 09:13:16 +0900
Subject: [PATCH] Add error advise when forgetting to import a language.

Closes #1001.
---
 lib/chibi/repl.scm | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/chibi/repl.scm b/lib/chibi/repl.scm
index fad9b498d..5c2d5e731 100644
--- a/lib/chibi/repl.scm
+++ b/lib/chibi/repl.scm
@@ -296,6 +296,8 @@
          (pair? (exception-irritants exn)))
     (let ((name (car (exception-irritants exn))))
       (cond
+       ((and (identifier? name) (not (env-parent (current-environment))))
+        (display "Did you forget to import a language? e.g. (import (scheme base))\n" out))
        ((identifier? name)
         (display "Searching for modules exporting " out)
         (display name out)