Allow writes without reads to global varsv2025-12-22

1 files changed, 2 insertions, 0 deletions

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.");
     }