From a337357d7b73021511024fb7aa2a2c2b284cf27f Mon Sep 17 00:00:00 2001
From: Bruce Hill <bruce@bruce-hill.com>
Date: Sun, 17 Jan 2021 23:37:27 -0800
Subject: Better debug info

---
 definitions.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/definitions.c b/definitions.c
index 0c99f9b..32399d7 100644
--- a/definitions.c
+++ b/definitions.c
@@ -34,7 +34,10 @@ def_t *load_grammar(def_t *defs, file_t *f)
     while (src < f->end) {
         const char *name = src;
         src = after_name(name);
-        check(src > name, "Invalid name for definition: %s", name);
+        if (src <= name) {
+            fprint_line(stdout, f, name, src, "Invalid name for definition: %s", name);
+            exit(1);
+        }
         size_t namelen = (size_t)(src - name);
         check(matchchar(&src, ':'), "Expected ':' in definition");
         pat_t *pat = bp_pattern(f, src);
-- 
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