From f10273d2ef7d5bdd3592c4c19476bd62a9b4a164 Mon Sep 17 00:00:00 2001
From: Bruce Hill <bruce@bruce-hill.com>
Date: Mon, 22 Dec 2025 18:32:31 -0500
Subject: Allow writes without reads to global vars

---
 src/compile/functions.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'src/compile/functions.c')

diff --git a/src/compile/functions.c b/src/compile/functions.c
index ec37c0ad..01377a89 100644
--- a/src/compile/functions.c
+++ b/src/compile/functions.c
@@ -630,6 +630,8 @@ static void check_unused_vars(env_t *env, arg_ast_t *args, ast_t *body) {
             const char *name;
         } *entry = unused.entries.data + i * unused.entries.stride;
         if (streq(entry->name, "_")) continue;
+        // Global/file scoped vars are okay to mutate without reading
+        if (get_binding(env, entry->name) != NULL) continue;
         ast_t *var = Table$str_get(assigned_vars, entry->name);
         code_err(var, "This variable was assigned to, but never read from.");
     }
-- 
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