DEBUGFILES

Fetching a value of DEBUGFILES from the environment to enable
debugpline() messages was intended to operate in wizard mode only
but that wasn't enforced.

src/files.c

@@ -4519,6 +4519,11 @@ debugcore(const char *filename, boolean wildcards)
 {
     const char *debugfiles, *p;
 
+    /* debugpline() messages might disclose information that the player
+       doesn't normally get to see, so only display them in wizard mode */
+    if (!wizard)
+        return FALSE;
+
     if (!filename || !*filename)
         return FALSE; /* sanity precaution */